Either bug or an missunderstanding

I think my correspondence rating graph is wrong. It changed somehow the progression.
And I dont get why in my profile it says I losse 22 points when i win against 1400? (he was higher rated when our match startet and before our match ended) and list against and lost against 2100 when i was over 1500? rated.
The rating number on the site sound more accurate

Which rating formular do we use? ELO like in Fide-chess?

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Reconnecting