Ring dependency detected for second calculated column

Right, so there's the problem.

I think the first thing to say is that calculated columns should not use measures.  That is not good practice.  The next thing to do is find a solution for the issues here.

Maybe you can rewrite Average Retail Price without using measures (it's possible that circular dependency errors will continue since I haven't seen your data or model)) or do it in Power Query.

I think those are good starts.