the inventory spots eventualy become unusable

What I expected to happen was...:
i could use all my inventory spots

What actually happened was...:
an account i own has a bug with the inventory that makes it extremely difficult to use specific slots when i bought a new computer the bug carried over and it infects other invintory slots. it seems to happen after a time as it doesnt seem to cause issues when i make a world but does after a while

Steps to Reproduce:
1. i honestly don't know but it is in the account