Bookmarks bar keeps resetting to some older set of bookmarks

On nightly build, main computer, my bookmarks keep reverting to some older “snapshot” of bookmarks. I try to delete say 1/4th the bookmarks and reorder the entries, and later, the bookmarks bar reverts to a prior version. I cannot find any reference to “Brave Sync” in the menu bar.

Version 0.74.7 Chromium: 78.0.3904.87 (Official Build) nightly (64-bit)