I’m getting multiple 500 error on your website. I can’t access my profile, jump previews, and most other pages.
Also, I jumped 3 times today and the online sinc only picked up two. I see a few posts about this, the two issues could be related.
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I have the same issue…
You can go to Action → Logbook. Create the pdf. Then the missing jumps should be listed right on top. Details missing. So the files get uploaded - but somehow processed wrong.
It’s actually since weeks like this… 
Well - I am still missing 3 jumps - find them in the Logbook. But not in the action list.
Furthermore are the values still incorrect. Like exit hight 3750 - and we jumped out of 3300. Something like this. ?!?
But I did 7 jumps this weekend at the Pink Boogie. New synchronizations seems to work. Stil values wrong. If I believe the Actions statistics then we had one headdown jump where we flew actually up again. 
That’s probably caused due to bad GPS signal…
So for me the Cloud statistics is more or less a count for my jumps. For my paper written logbook I use my own values. Kind of sad - because the Logbook is the main reason I bought the Dekunu…
@Freiheitenwelt I was referring to the 500 errors on the website. Although I have a similar problem to you. I did 6 jumps one day, the device shows 6 jumps on it, but the website logbook and actions only show 5.