Modpack version
0.3.13

Describe the bug
It is possible to glitch yourself an item by throwing an item of the same type out of your inventory by using strg + q and then keep strg pushed and klick on the field where the thrown out item was in before. With that you get another item of that type into you inventory.

Logs
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Screenshots
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Thanks for the report. Which key is strg?

:D I didn't even realize while reading. It's ctrl in german.

Oh, thanks Darkere. I didn't thought about that either. Of course I meant ctrl. Silly me ^^

I cannot reproduce this, could you perhaps make a video of it? Or was this on a server?

The problem appers on a server and every player is able trigger the glitch.

Oh, awesome, thank you!

After some experimenting I found that Inventory Essentials causes this. I've reported it to their issue tracker.