iPhone 12 Pro – Problem with iCal on iPhone

Something very strange is happening in iCal on my iPhone.

I have a number of appointments scheduled on different calendars.
When I want to change the time of an appointment, I keep my finger pressed on the appointment and I move it.
At this moment, all the calendars disappear and I have to go manually reactivate my calendars.

I attach the video showing this problem on https://www.dropbox.com/s/c4sr6upijiqz37t/EMBI – Pb iCal.mov?dl=0

Has someone already had this problem ?

Thanks for your help

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