Can't unbind moude 4 and 5 from gadgets

So, I originally binded prone to mouse 5 and crouch to mouse 4 and had no issues. However tonight I started playing and whenever I pressed mouse 5 I went into a prone position but ALSO got gadget 2 on my hands and whenever I pressed mouse 4 I went into a crouched position but ALSO got gadget 1 on my hands.
I checked reddit and found that somebody solved this issue by unbinding each and every instance of the use of mouse 4 and 5 key bindings on vehicles. 
I did that, I have only binded prone to mouse 5 and crouch to mouse 4 respectivelly but this bug still persists. (I know I only have it binded like such as I do not get the notification that I get when I'm assigning a key bind to an already existing one).
This has led to frustrating experiences like me trying to rush a guy, crouch slide for adv. and end up with a javelin in my hands unable to shoot.

Please consider solving this issue.