Hi Caspar and a warm welcome to you from all the Staff and Moderators. It's so difficult to advise you without seeing a picture. Here is one showing an adult with 3 newly-fledged young. You'll see they do look a little bigger. But is that what the one you are seeing looks like?
WWW...
If you have got a picture and are not sure how to upload it, please don't be afraid to ask.
I'm sure you will enjoy it here and I look forward to hearing your news.