The event “Help Tekki fight off creatures swarming from the asura gate” appears to be bugged. I entered the Ulta Metamagicals area two days ago and began working on completing the heart quest, of which one option is to collect crystals to give to Tekki. I collected quite a few and found Tekki, but I could not give them to her. The Help Tekki event was displayed in her area, claiming that griffons need to be killed, however there were no griffons or anything else present to be able to finish the event.
I left and returned again tonight, hoping to be able to give the crystals to her now, but I find it in the same state. There are no enemies to fight for the event, so it does not do anything, and is most likely what is causing Tekki and the merchant by her to not react properly by accepting crystals/acting as a vendor.