Probably not the reason, but worth to do a quick check:
Sometimes the update cache interferes, so if something's odd with updates - some module (or core) claims to have updated, but then...
The issue with checking for updates in the BackdropCMS dashboard makes website development and maintenance more difficult. I manage more than ten websites hosted by two different providers, one...
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Suggestion for Dev meeting:
Use of
db_queryvsdb_select/db_update/db_insert/db_deletehttps://github.com/backdrop-ops/docs.backdropcms.org/issues/256