I'm looking at my personal sessions under https://www.gps-speedsurfing.com/mygps.aspx?mnu=mysessions and this only shows the sessions made this year. A couple days ago all years where visible here. It's not only in this view but also fe. https://www.gps-speedsurfing.com/default.aspx?mnu=evaluatedrankings. Selecting previous years returns No data found. 

They are not all gone, using the https://www.gps-speedsurfing.com/default.aspx?mnu=searchSessions returns all sessions...

I have the same problem, all my sessions prior 2019 I cannot see, also in my dashboard Top10 Alltime only shows sessions from 2019...

Thnx for reporting, we are doing some upgrades on the backend site of the website, so we think this is related, but no worries, all session data is still there :) Keep you posted !

can you confirm that it is fixed?

Yes, seems like everything is working fine again now, thank you!

Yes, thanks!