Duplicating layers causing objects to ungroup

I'm having problems when copying/duplicating layers inside a slide on Storyline, when pasting the new layer it causes any grouped objects to ungroup, and also any text boxes added to scroll panels to also ungroup etc.

This happens regardless of if the layer is copied or duplicated, and happens whether the layer is within the same slide or another. It's resulting in having to regroup lots of objects and apply animations all over again multiple times. very tedious.

I've never had this issue previously. what's happening?