I've trawled through as much of this place as I can seem to manage with the search, and this is the only thread that seems to have the same issue I've been having - I started playing again recently after not having the game installed for ages, and realized that almost none of the creations the game said were uploaded actually made it to the Sporepedia. I've tried just about everything people have suggested for similar problems, but none of it actually did anything beyond giving me a second install of the game through the Origin launcher that still gives me the same problems - and there being no solution in this thread isn't very encouraging, honestly. Maybe by throwing my own comments here there'll be a chance at someone noticing and helping us out? Here's hoping.
