Why is my script not detecting if its a premium player or not?

	if players[1]:IsInGroup(5732076) then
				print("group player")
				-- group player
				players[1].leaderstats.Cash.Value = players[1].leaderstats.Cash.Value + 75
				players[1].leaderstats.Wins.Value = players[1].leaderstats.Wins.Value + 1
			elseif players[1].MembershipType == Enum.MembershipType.Premium then
				print("premium player")
				-- premium player
				players[1].leaderstats.Cash.Value = players[1].leaderstats.Cash.Value + 100
				players[1].leaderstats.Wins.Value = players[1].leaderstats.Wins.Value + 1
			else
				-- normal player
				players[1].leaderstats.Cash.Value = players[1].leaderstats.Cash.Value + Reward
				players[1].leaderstats.Wins.Value = players[1].leaderstats.Wins.Value + 1
			end

If they are in the group, it won't detect if they have premium too. Realistically you should be putting two if statements to detect if a player is in both.

if players[1]:IsInGroup(5732076) then
	-- do stuff here
end
if players[1].membershipType == Enum.MembershipType == Enum.MembershipType.Premium then
	-- do stuff here
end

The way you've coded it is telling the script if they're in the group, ignore the bonus for premium. Hence the 'elseif'.