Tbm vor

I have silly question
When flying vor and it’s aligned to station with correct frequency and also the nav pressed button and vor1 while flying the course whe. I click on auto pilot the plane seems to keep going on circle although it’s aligned straight to the radial station

Also I normally scroll to zoom in or out using mouse but when I go to increase say vertical speed or flight level change for example the zoom keeps coming on in and out how can I fix that