Hi silversurfer83,
thank you for pointing out other apps for editing. I will try Every Door if I really want to edit the map on my mobile again. To be on the safe side I think I will stick to doing the editing on the openstreetmap.org website with the integrated editor most of the time.
I think this is a wonderful project. I would like to be a small part of it and I am grateful for the many contributors who support it with so much commitment and time.

Thank you so much for your support and effort and again my apologies for the chaos I caused. I will be much more careful from now on.

Sorry for the confusion, obviously the data was stored locally on my mobile and was now added when I logged in. Is there a possibility to revoke all the changes I uploaded?