Two weeks of data from Health app missing

Since late 2020 I’m vigorously keeping an eye on my steps in the health app. Trying to walk more, like everybody else this pandemic :). Yesterday I noticed that two weeks of data are gone, from 2nd - 16th of April.

The strange thing is, sometimes I can see them in the long list of data at the bottom (as indicated in this screenshot) (‘show all data’ I reckon, I have settings in another language), but they seem to appear and disappear at random. In the graphs up top they are gone all the time though.

I like the stats, trying to take 7500 steps each month, trying to do better than last year, etc. But now I cannot compare them anymore, and I’d like my data and goals back :). What could be the issue here?