I don't think I've seen this problem mentioned with Wesson before.
Some people had a similar problem talking to the 4 sleeping people in Broken Valley, near Bellagar's shrine in the bandit area mountains. The workarounds in that case were to either save before talking to each person, and then just reload if there was a problem and try again, or after exiting the conversation quicksave when stuck, exit the game, restart the game and load the quicksave (which should get everything back to normal).
If the quicksave / exit / reload method doesn't help, there is something else you may be able to try. If you go to the main camp of shipwrecked people and talk to Radcliff, he will tell you he wants to challenge the other enchanter. If you talk to Wesson and end with that, maybe that will avoid whatever problem you had talking to him before.
