Ah, now this tells me something and I think you're right. Mac Notes has some additional formatting stuff in the background that might confuse poor old RVCLB.
I received your email but the attached file wasn't the database unfortunately, just a clipping. But the info you give me certainly adds up.
Can you try an experiment for me, please? Can you copy a note from Mac Notes as normal, and paste it into RVCLB notes, but using a different keyboard combination? Instead of the usual Command-V, can you use Shift-Option-Command-V? This keyboard combo pastes text, except that it strips out the additional formatting. This would confirm the issue for me.