Ah welcome to solar imaging. Now you are gonna find out what seeing really is all about. Hehehehe
I would check it for astigmatism as this is what I thought too. When imaging you should be able to see the fine filaments on the video in reasonable seeing. If not you most likely have some astigmatism in the scope and like Dave said it is fixable.
Might I suggest you download a copy of Avistack and use this for solar processing. It works better than RS for solar work and for lunar too.