Hi, this isn’t a bug, so you need to move it to community support. I’m sure one of the mods will be able to help you move it.
I use the throttle axis on my sidewinder ff2 stick for the collective, and the throttle on the X52 for the throttle (i don’t use the X52 stick as I don’t like the spring)
You may be able to assign the collective to the slider on the x52 throttle? Either way you ideally need two axis, one for throttle and one for collective.