Auto Jump Glitch/Bug

So I am on a windows keyboard where there is a shortcut. Fn+Space allows you to change the lights on the keys. However, when I press Fn+Space, my Minecraft character keeps jumping without me pressing space.

How to replicate:

1: Get a windows computer that has the shortcut I specified.

2: Hold Fn and then press space.

3: Let go of the keyboard.

4: Your character should continuously jump