Where is this coming from?

Hi! Im currrently trying to model this tower and have noticed this second ring appearing when I input my code on the top and its throwing off my design when I input loft. Where is this coming from? How to I fix it??

probably this, otherwise share your file
image

I can attach my file here ;-; I’m not super familiar with rhino and this is really stressing me out cause its due tomorrow ;-; I changed the base shape to a polygon in efforts to try and fix it but nothing has changed
poo.gh (17.1 KB)

I gave you the solution, you implemented it as well, so what’s your current problem then? It lofts fine:

Sorry I meant it doesnt loft properly later on! I attached the file with the further progress and you can see that it only lofts the offset on the top portion.
poo.gh (19.3 KB)

you need a flattened result for the loft to work, but also the input curves need to be similar in shape in order for this to work. Otherwise you get indeed something that is alike the name of your file:

haha i figured out the issue with the offset shape but after flattening the result and changing the input curves its telling me that my region difference function “1. Solution exception:Object reference not set to an instance of an object.”

This error almost always relates to some values being Null. Use Clean Tree component to get rid of those or modify the code before the Nulls are generated.