MIg-15's elevator trimer works as aileron trimer

[bin801]

to tilt down mig-15's head, I moved elevator trim handle. But I feel there is no reaction on elevator, but roll to left (or right? I forget)

push elevator trim handle forward, mig15 was trimmed roll to right

pull handle backward, mig15 was trimmed roll to left.

 

but the aileron trim switch works fine as design.

 

I don't know why