Not sure if this is a bug or a feature, but ticked tags seem to be persistent between notes for me.
So for example, when I tick tags A, B and C in Note 1, the same are already selected when I start Note 2.
This is AFAIK not the expected behaviour.
However, if you want an analysis by anyone, more information about your system and the version of Joplin is required.
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Using a Vivo phone flavoured Android (v13), device model Y33T. Joplin v2.12.3