Default TWRP Restore - no data restore

Hi, looking for some help if someone would be kind enough.

I wanted to try out Cyanogenmod. I made a backup in TWRP. Installed CM and played around for a while. Decided to go back to stock. Went to restore and the restore fails on data. I decided to see if everything else restores, so I unchecked data and everything else went fine. It's only the data that will not restore.

Anyone have any idea why that might be? I'd like to get everything back if possible. I read on another site I might be able to pull the TWRP backup and restore with titanium backup. Gonna look into that.

Any help would be appreciated, thanks.