Received a bug report with reproducible misbehavior in v1.7.0.
Seems the "CleanUp Database" feature is broken after rewriting the settings page.
There's a problem with the plugin, as of 1.7 the 'CleanUp Database' is not working any more.
After roll back to 1.6.3 it's working again.
Verified on WP 5.0.x and WP 6.4.x, both with Statify 1.8.4.
The setting file is completely rewritten and it's difficult to compare with the former one. But it looks like you forgot the call of the cleanup function.
Received a bug report with reproducible misbehavior in v1.7.0.
Seems the "CleanUp Database" feature is broken after rewriting the settings page.