Gamepass script allows player to purchase gamepass despite player already owning gamepass?

I have a gamepass script that fires an event when a part is touched. This event prompts a gamepass to the player that gives extra walkspeed to the player if they buy it. However, when I run my game in Roblox Studio, buy the gamepass, and reset my character, my character no longer has extra walkspeed and the player can buy the gamepass again. Even if I do not reset my character, the gamepass can be bought again.

There was no error in the output window and I've attempted to debug this issue by putting print statements, however, I failed to find any possible code that could've caused this.

Here are my scripts:

DetectGamepassRequest (Located in ServerScriptService) (Script):

> local part = workspace.Part
> local Players = game:GetService("Players")
> local MarketplaceService = game:GetService("MarketplaceService")
> local gamepassId = 74392253
> local ReplicatedStorage = game:GetService("ReplicatedStorage")
> local GamepassEvent = ReplicatedStorage:WaitForChild("GamepassEvent")
> 
> part.Touched:Connect(function(otherPart)
>   print("1")
>   local humanoidCheck = otherPart.Parent:FindFirstChildOfClass("Humanoid")
>   local player = Players:GetPlayerFromCharacter(otherPart.Parent)
>   
>   if humanoidCheck and player then
>       print("2")
>       GamepassEvent:FireClient(player)
>   end
> end)
> 
> GamepassEvent.OnServerEvent:Connect(function(player)
>   print("3")
>   local character = game.Workspace:FindFirstChild(player.Name)
>   character.Humanoid.WalkSpeed *= 2
> end)

GamepassHandler (Located in StarterPlayerScripts) (LocalScript):

> local Players = game:GetService("Players")
> local MarketplaceService = game:GetService("MarketplaceService")
> local gamepassId = 74392253
> local ReplicatedStorage = game:GetService("ReplicatedStorage")
> local GamepassEvent = ReplicatedStorage:WaitForChild("GamepassEvent")
> local player = Players.LocalPlayer
> 
> GamepassEvent.OnClientEvent:Connect(function()
>   print("4")
>   local playerUserID = player.UserId
>   local hasPass = false
>   
>   local success, errorMessage = pcall(function()
>       hasPass = MarketplaceService:UserOwnsGamePassAsync(playerUserID, gamepassId)
>   end)
>   
>   if hasPass then
>       print("5")
>       print("Player already owns the gamepass!")
>   else
>       print("6")
>       MarketplaceService:PromptGamePassPurchase(player, gamepassId)
>   end
>   
>   if not success then
>       print("7")
>       warn("Something went wrong when checking if user "..player.Name.." has the gamepass! "..errorMessage)
>   end
> end)
> 
> MarketplaceService.PromptGamePassPurchaseFinished:Connect(function(playerWhoPurchased, soldGamePassId, wasPurchaseSuccessful)
>   print("8")
>   if soldGamePassId == gamepassId and wasPurchaseSuccessful then
>       print("9")
>       GamepassEvent:FireServer()
>   end
> end)

GamepassPerksHandler (Located in ServerScriptService) (Script):

> local Players = game:GetService("Players")
> local MarketplaceService = game:GetService("MarketplaceService")
> local walkSpeedId = 74392253
> 
> 
> Players.PlayerAdded:Connect(function(player)
>   print("10")
>   player.CharacterAdded:Connect(function(character)
>       print("11")
>       local hasPass = false
>       local playerUserId = player.UserId
>       
>       local success, errorMessage = pcall(function()
>           hasPass = MarketplaceService:UserOwnsGamePassAsync(playerUserId, walkSpeedId)
>       end)
>       
>       if hasPass then
>           print("12")
>           character.Humanoid.WalkSpeed *= 2
>       elseif character.Humanoid.WalkSpeed > 16 and not hasPass then
>           print("13")
>           player:Kick("Please stop exploiting the 2x speed gamepass! Reason: Hacking") -- anti cheat (optional)
>       end
>   end)
> end)
> 

As always, thank you for your time and I appreciate any help anyone gives me!