I have the same issue with V3.54. I’m in contact with a Victron technician concerning this issue. The diagram should show the yield of the last 10 (small display) or 13 (big display) days inclusive today with the most recent bar on the left. However, this is not working properly. In my case it happens that the diagram ist not updated for days or even for weeks and thus shows old data. That happen even the most recent data is available. When I tap on the display and go to
Solar Yield > History > Last 31 Days > Table
it shows the last 31 days as expected.
It seems to be quite clear, that the problem is based on a software error. I hope Victron will fix this problem soon.