This has been a bug before, in 1.7/1.8 but I've found that it happened again, in the latest versions. When you press tab and shift, you doing go to the left when pressing a. It doesn't seem to happen with any other keys
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tryashtar
Arisa Bot
Thank you for your report!
We're tracking this issue in MC-54194, so this ticket is being resolved and linked as a duplicate.
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This is an issue with your keyboard
https://en.wikipedia.org/wiki/Rollover_(key)#Key_jamming_and_ghosting