Is there a specific book or chapter where you're having trouble, or is it everywhere in the app? By "footnote cross reference," I assume you mean a footnote that's part of content, not a link that you created yourself?
The most recent version of Gospel Library for iOS, 4.0.5, was released on March 21st, about 2 months ago. Is it just recently (in the past week or two) that you've started seeing the problem? If so, it could have been an iOS update or a content update that caused the problem.
Samuel Bradshaw • If you desire to serve God, you are called to the work.