Congrats, "European descent".
People have moved across the area for ages and there is nothing anyone can tell you (and remain honest).

Seeing as a lot of your family lived in Great Britain, the Great Britain should be no shock.
Norman invasion, hello Europe West.
Vikings, hello Scandinavia.
Irish? How'd they get in there? ;)
And that's not even just normal movement.
Plus lets not forget that non-paternity events are speculated to be between 4% and 10% and despite what some might suggest, I sincerely doubt that number has been widely different over time.