Our blog hidden link has different interconnections between posts and their authors (custom post types). We noticed when filtering per author e.g. Ryan Young (on the right side), it shows posts assigned to other authors e.g. Clyde Wayne Crews.
Per our check the DB fields have incorrect values, while the backend is correct and the front-end info is correct (apart from showing up wrongly during filtering).
When I try to fix the values in DB, it works for some posts, but after a couple of fixes, the things revert back to the already fixed ones.
It would appear that you only have our Types plugin installed, which only has the effect of allowing you to create custom post types. Our Types plugin isn't able to randomly change the values in the database on the post type without a user input.
I suspect that this issue is being triggered by another plugin. What I would recommend that you do is to temporarily disable all the non-toolset plugins and then check again to see if the post authors start changing again.