I'm sorry about the darn credits issue.
It is a real stinker!! We have been trying to find/fix the issue for over a year, I have hired 3 different people to try to fix it and still no one can figure it out.
The big bummer is the company that makes the gallery is no longer open so I can not hire their tech support fix it for me. They also no longer create updates or patches etc.
It seems each time we need to update the forum, the gallery just gets more glitchy (the forum and gallery are different companies and we need to update the forum often for improvements and security patches etc). I wish a new company would make a new and improved gallery ... but until then we don't have a lot of options unfortunately.
Hopefully you can get in the habit of copy and paste of your credits or entering them on the second page. I always enter them on the second page and once in a while that doesn't even stick, then I have to go back and edit my LO to add the credits again.
The gallery is such an important part of our site (and most other scrapbooking sites too), eventually we are all going to have to find another option, since we all pretty much use the same old gallery. Until then we will have to love her even with her glitches. LOL