I think this is the other aspect to keep in mind here - the circles are still real circles, you’re just seeing a preview which has become segmented due to the scaling.
Feel free to PM me and if it’s simple enough or obvious enough I can give your graph a quick once over, but I’ve got more on my plate then I can handle if it’s more in depth. Also include your work email and I’ll see if I can find another resource based on resources through your professional affiliations, but no promises there either. You could also try and submit a case directly to Autodesk support as you would with any other product.
-jacob