Clicking while walking freezes the character

Basically, if I click while moving in a direction, my character freezes in his place, and I am unable to move until I repress WASD. This is really annoying for me, but on my brother's computer the bug doesn't occur. I would really hate it if no-one else got this bug hence it not getting fixed 😞 Screenshots don't really explain the problem so I can't upload those.