What does the two-headed arrow mean on my notes?

I logged in to the web app today to see this red split-arrow on several notes:

Screenshot 2025-12-18 132206

The notes appear to be copies of each other with various differences. I assume these are different save points/edits that had saving issues? I just want to be sure (and if anyone can tell me if there is a way to merge these, that would be awesome).

These notes were all made on the web app. The arrows persist on other platforms.