when Mateo asks you to get the money if you talk to Thorben about it after the first line, you instantly will see line how Gritta had 100 gold without even talking to Gritta about it if I remember right if you pay off Gritta's debt Thorben is supposed to thank you latter for it but he never does this and only the option about the 100 gold is left there. (I don't have a save about it take Matteo's quest and talk to Thorben the bug should show)
