Also for the webflow sitebuilder import, i have ran into a couple of issues
I would not say common however I know we've had some issues with spacing strategy and the webflow app.
For duplicate classes - you will need to rid your entire project of all duplicate classes before you'll have any chance of not having them show up again, once you've done that, I would paste in a component and if it fails to sync, I would turn class sync off, save, refresh, turn it back on, save, refresh and try pasting again.
There are some other tips here:
https://www.relume.io/resources/docs/how-to-fix-and-prevent-class-duplication-in-webflow
Class sync is extremely complicated, and sometimes the wrong scenario happens where it doesn't sync properly but if caught quickly and following the steps highlighted in that doc above, you should be able to resolve quickly and move on with pasting more components without issue again.
