MS OneDrive is perhaps messing you up. There are many discussions about LrC and OneDrive. Many of us find it best to avoid associating our catalogs with OneDrive. It just screams for trouble. It is highly likely that the folder you place your catalog in is one that gets automatically synced to OneDrive. Blame this on MS for insisting that Windows users login using MS accounts instead of local, and treating OneDrive as the best thing since sliced bread (White bread, not so great). Most members do not intentionally place their catalog in OneDrive, that is, they do not actually run the catalog from OneDrive, or any other Cloud or Network Share, but instead just accidentally, no fault on their own (read bad bad MS) . To stop this connection between the catalog and OneDrive, you could create a folder that is not associated with OneDrive, and move your catalog to it, or you could manage your OneDrive and disassociate the catalog (or more likely the folder) from OneDrive. Some think that OneDrive is a great place to backup to, but how much OneDrive space do you have??? And if you do want to do that, then sure, copy or backup your catalog, but do not auto sync. A consideration considering LrC catalogs and auto sync to OneDrive. Each and every edit, each and every mod, heck if you even look cross at your catalog, results in a sync to OneDrive. This can get very very chatty across your Internet access. Apparently LrC does not exactly like such busy talking back and forth. Performance can degrade, and catalogs can (rarely) get corrupted.
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