Doesn't support overstacked items

[JHarris12345]

Describe the bug
If your server allows overstacked items (like being able to stack potions up to 64 in 1 slot), then trade doesn't like this and gives the player wrong amounts

To Reproduce
Steps to reproduce the behavior:

1. Add a plugin that allows you to gather a stack of potions (or any other item that you shouldn't be able to stack)
2. Trade with it

Expected behavior
The correct amount of items should get added

Screenshots
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Additional context
Add any other context about the problem here.

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