A client's WordPress site has been behaving strangely recently. I suspect that there are database issues but I'm not sure where to start looking.
The most recent example of strange behaviour:
- Added existing page to existing nav menu in WP backend (Appearance -> Menus)
- All recent changes to database in the form of (I believe) post metadata and plugin data was immediately wiped out.
What could cause such behaviour? I don't even know where to start. Any suggestions would be greatly appreciated.