Frist, the NPC are bugged, even with equipped banner it is a mystery how to talk to the NPCs.

After 30 minutes finally i was able to talk to it and managed to buy a worldspring dragon egg to sell. Why is it not tradeable??
I just spend 400 coinson it,nowhere mentioned it is not tradeable, and now im stuck on a egg that i cant use.
I have the dragon already and bought the dorant egg from market without a problem. Why is it not tradeable anymore?

Please fix it or refund me the coins