Bible References in PBB

I encounter "errors" with Bible References "sometimes" when I compile a book. E.g., When I reference (something like) John3.16, all is well. Sometimes, when I reference John3.16, 19, 21 (or something like this), the first reference works perfect but linking "19" to John3.19 produces an error on compiling. And, this error is not consistent, some verse only, no Bible book/chapter cited, work fine . . . then, some don't.

So, I figured I'm missing something in my linking . . . any thoughts or suggestions?
Thanks,
Jerry