I understand this sounds really dumb, but, I enjoy keyboard and mouse on Minecraft

But, recently, ever since I turned on a stopwatch timer (because I wanted to speedrun), spacebar has not worked, even after deleting the files of the stopwatch. The only way spacebar ever works, is if I change my Jump Control to "Space" before I play a world, and then it works.

And I probably will have to do that every time.