Using left and right click at same time makes glitching the jump/fly

Hello there,

Here is the scenario :

• set Bouton1 (left click of the mouse) for jumping/fly up
• set Bouton2 (right click of the mouse) for sneaking/fly down

And what happens is weird. If I press both boutons at same time, or by accident I begin to jump then I want to sneak, or even worse when I fly in creative and want to sneak but I go too quickly, I'll jump or go up infinitely. I've to press a button or open an inventory of any kind, then it stops jumping/flying up.

 

Best regards,

Terminator6873