I went to talk to Anton. On using the option of "I have more questions" I was trapped in dialog loop and had to move my character away to break the conversation. Then talking to him again to try and progress the quest. However, after picking "Let's go" the quest marker stays on Anton and he's following me. I don't actually get the quest Grey Matters. I only figured out the name by reading the other threads. I reloaded back to an older save outside of Goodneighbor and just went through the dialog and just picked "Let's go" but it did the same thing were the quest marker stayed on Anton and he got up to follow me and didn't get the quest.