After Hannag was sharing her knowledge I got the third slot for a source point. Some time later all of a sudden I wasn't able to talk to Sir Lora and realized that the talent simply was gone. All members (Lohse, Red Prince and Beast) still had 6 talents at lvl 15, but my char had not.
There was no point left to spend in this talent again or another one. On my char there only were 5 talents remaining.
I don't know if the result of chosing Hannag with the consequence of all animals in the forest dying was all the time like that. Actually it even would make sense.
If not maybe this "problem" is connected with this issue