"Contains Vendor Ad" does not stay enabled when editing post.

I took a quick video of this, but basically, the "vendor" flag does not stick on the posts. I set a photo to be a vendor, no ai, no render, added to public gallery. After it posts if I edit the post, the "vendor" option is unchecked. If I check it again and save, it does not seem to stay enabled.

https://gyazo.com/e97587e342a5cdd43f416036f4bd2989