I just had a look at this as it relates to my tree. There are two ancestors named here. The first is Alice Maud Butterfly Pond AKA Hudson (-1441). I am assuming that the name Butterfly is what is causing the problem, but Wikitree gives you a space for nicknames which I fill in when I know the nickname so it seems to me that this problem is self-generated. Should I remove all nicknames? The same applies to my second example which is Norman Spencer Spen Deeks (-93) where I assume the nickname Spen is problematic?