script seemingly randomly triggering unequipped event when tool is equipped?

hello. so, put simply, i have no idea what is wrong with this script. if the Equipped event is put before the Unequipped event, the equipped event works normally, but as a result the Unequipped event never fires. but, if the Unequipped event is before the equipped event, the function the Equipped event calls breaks, as a result of the function called in the Unequipped event being called before it for... some reason? i tried reproducing the effect in another tool, but it works perfectly fine there no matter the position of the equipped and unequipped events.

here is the offending code (sorry for the semi-wall):

function EndAnimation()
	local p = weapon_parts[1]:GetChildren()
	for i = 1, #p do
		if p[i].className == "Sound" then
		p[i]:Destroy()	
		end
	end	
	if motors[1] then
		motors[1].Part1 = character:findFirstChild("Left Arm")
	end
	if motors[2] then
		motors[2].Part1 = character:findFirstChild("Right Arm")
	end

	if welds[1] then
		welds[1]:remove()
		welds[1] = nil
	end
	if welds[2] then
		welds[2]:remove()
		welds[2] = nil
	end

	weapon_parts[1].Parent = nil
	if weapon_model then
		weapon_model.Parent = nil
	end
	coroutine.resume(coroutine.create(function()
		if weapon_model then
		local swm = weapon_model
		wait()
		swm.Parent = nil
		wait(0.1)
		swm.Parent =  nil
		wait(0.5)
		swm.Parent =  nil
		end
	end))	
end

--WeaponAnimation is the viewmodel reference
--WeaponObject is the world model (object that the character holds)

function StartAnimation()
	if humanoid.Health <= 0 then return end
	
	local check = {torso:findFirstChild("LeftWeld"), torso:findFirstChild("RightWeld")}
	if check[1] then check[1]:remove() end
	if check[2] then check[2]:remove() end

	local check2 = {character:findFirstChild("WeaponObject")}
	if check2[1] then check2[1].Parent = nil end
	if motors[1] then
		motors[1].Part1 = nil
	end
	
	welds = {Instance.new(conn_type), Instance.new(conn_type)}
	welds[1].Part0 = torso
	welds[2].Part0 = torso
	welds[1].Part1 = character:findFirstChild("Left Arm")
	welds[2].Part1 = character:findFirstChild("Right Arm")
	welds[1].Name = "LeftWeld"
	welds[2].Name = "RightWeld"
	welds[1].C0 = CFrame.new(-1.5, 0, 0)
	welds[2].C0 = CFrame.new(1.5, 0, 0)
	welds[1].Parent = torso
	welds[2].Parent = torso
	
	weapon_parts[1].Parent = character
	local wep_weld = Instance.new(conn_type)
	wep_weld.Part0 = character:findFirstChild("Right Arm")
	wep_weld.Part1 = weapon_parts[1]
	wep_weld.C0 = CFrame.new()
	wep_weld.Parent = weapon_parts[1]
	
	local weld1 = welds[1]
	local weld2 = welds[2]
	
	local r_serv = game:GetService("RunService")
	
	local move_anim_speed = 3
	local last_p = Vector3.new()
	local move_amm = 0
	coroutine.resume(coroutine.create(function()
		while weld1.Parent ~= nil do
			local delta = wait()
			local cur_p = torso.Position
			if (cur_p - last_p).magnitude >= 0.1 and humanoid.Jump == false then
				move_amm = math.min(1, move_amm + delta * move_anim_speed)
			else
				move_amm = math.max(0, move_amm - delta * move_anim_speed)
			end
			last_p = cur_p
		end
	end))
	
	local last_va = 0
	local last_va2 = 0
	local view_velocity = {0, 0}

	coroutine.resume(coroutine.create(function()
		wait()
		local last_time = tick()
		while weld1.Parent ~= nil do
			r_serv.Heartbeat:wait() ------------------------------------------------
			if humanoid.Health <= 0 then return end
			local delta = tick() - last_time
			last_time = tick()
			
			local breathe_amp = 3
			local breathe_freq = 1
			local breathe = math.sin(math.rad(tick() * 40 * breathe_freq)) * breathe_amp
			
			local shake_freq = 10
			local shake_amp = {0.15, 0.15}
			local arm_shake = CFrame.new(
				math.sin(math.rad(tick() * 45 * shake_freq)) * move_amm * shake_amp[1],
				0,
				math.abs(math.cos(math.rad(tick() * 45 * shake_freq)) * move_amm * shake_amp[2]))


			local anmtp = _G.AnimType
			local anmst = _G.AnimState
			
			local view_angle = 0 
			
			if anmst == nil then
				anmst = 0
			end
			
			if anmtp ~= nil then
				if Animations[anmtp] == nil then
					anmtp = "Default"
				end
			else
				anmtp = "Default"
			end
			
			local curr_anim = PlayAnimation(anmtp, anmst) --left, right, weapon, wep trans
			
			local chestCF = CFrame.new(0, 0.5, 0) * CFrame.Angles(math.rad(math.max(-rot_amplitude_chest, math.min(rot_amplitude_chest, view_angle)) + 90 + breathe), 0, 0)
			weld1.C1 = (chestCF * curr_anim[1] * CFrame.new(0, -0.5, 0)):inverse()
			weld2.C1 = (chestCF * curr_anim[2] * CFrame.new(0, -0.5, 0)):inverse()
			wep_weld.C1 = (curr_anim[3] * CFrame.new(0,0,-0)):inverse()
	
		end
	end))
	
end

local last_st = 0
local eq = false

tool.Unequipped:connect(function()
	eq = false
	EndAnimation()
end)

tool.Equipped:connect(function()
	if eq then return end
	eq = true	
	StartAnimation()
end)