Hello together, after your two surveys I removed the ponds. I checked and these were added over 10 years ago by user "Marielchen". I know that this mapper added a lot here in this region but back in the days very unprecise and "rough", you can still see her very "special" mapping style in this area of Bad Münstereifel, where she was drawing forests in private gardens etc.. The aerial imagery back then was also not good. So my guess is that Marielchen just draw way too big ponds here because she did not know better and there was only a little bit of wetland 10 years ago but no more.