Forms sent but not appearing in export

Hi all,
I am having a few issues with forms on the tablets being marked as sent and app successfully syncing with server but when i export/download the forms as a csv file there are a whole lot of forms missing. Any tips on how to overcome this would be great as i dont want to lose the data.

Hi all,
I tried again 24hrs later and all working fine. I think i was downloading new files but somehow been opening up the old one :woman_facepalming: