I’ve observed a couple of times now that when working on page A in Window 1, switching to Window 2 with a different page B, LogSeq nevertheless detected a conflict between page A in Logseq and the file for page A on disc. With the file on disk being the latest version.
If the observation is correct, it appears that LogSeq uses different graphs in both windows, rather than the same. Thus you can get sync conflicts between the graphs.
If so, that appears to be a bug.