ApexCharts - weird behaviour, maybe DB migration related?

Hello there,

I got a migration of the DB yesterday as I was upgrading HA.
Looking at my temperature graph this morning (yesterday evening DB upgrade was still ongoing) I see this in Apex card

EDIT it is most probably data related, not Apex.

Someone already experienced that? (And, btw, the page timed-out and I had to click on “wait” multiple times)

“time heals all wounds”
It solved itself, as expected, but still don’t know what happened.