Can't summon the 4th specter

Hello,

Sorry to bother you with that, but I have invest a lot in the new specters, have all the requirement to get 4 specters (has described in my skill description : "maximum 4 raised specters",)
But when i wanted to summon the 4th one, it erased the first i got (120 c gone uhhh) and still cant get more than 3.

Really painfull...

May you help me?

Ty

Dibou