spline mesh twist on itself

This is a known issue that is related to the splines up vector. Maybe this post will help to get your splines fixed.

Some time ago I did some testing with this plugin from the Marketplace. It comes with a price tag and is working only up to 4.23, so I don’t recommend to use it for any commercial project.

Don’t know why the developers left their plugin, maybe it’s easier now to get this spline issue fixed. The source code however is available on Github and after some changes I managed it to get it compiled to work with UE5.3.2.