Hello experts.

I have a Seestar S30 Pro and trying to move from the default Alt-Az mounting to EC using a Seestar TH10.

Whenever I use the EC mount and line up my Lat of 50.5° and then do a Polar alignment. I get a green tick pass from the alignment when I'm  within 0.5°.

However, the scope rectangle once I have selected any target looks like this ( image), which seems strangely locked over to one side, that forces me to start framing in order to capture any large object. Can some wonderful person help out a learner who is frankly struggling with this issue.

I am using 30 sec subs at the image comes out OK, Except it has to be framed each time to overcome this strange off centre image rectangle