Empty frame when uploading to Musescore Forum ?

Hoping, this mystery can be solved :

I uploaded with succes a score to the Forum.
Then I wanted to correct the score, and deleted the score ( in stead of updating the score, which I should have done).
Trying to upload the corrected piece again , it is accepted, but now you only see an empty white place, where the noted should have been. These occur, if I click in the empty place.

What can I do to upload correctly again , what can be the reason ?

With thanks and Kind regards