I've looked everywhere to try and solve this problem myself, and it seems that the only way to do it is for support to change an entry in their database. I'm posting here in hopes that someone from support will see this. My steam user name is alexthelion2.
Yeah, this can happen if you purchase TITANS in Steam, then link your Steam account to a different PlayFab account. But Support can help you add TITANS to your account. Please send an email to support@uberent.com and we can help ya out.