fixedfixer
Veteran
Looking at the picture of the bike again it looks new or just had a repaint. In this case the threads may not have been cleaned out (paint gets in there). Frame respray places tend not to clean them out as the tool used to do the job is so fine it can break off in the frame and be a faff to sort out. So it's often left to the owner to do this. Park tools have a 'reamer' I think they call it that will do the job. Use some grease on the drop out screws so the don't get stuck into the frame.