Sometimes selling the consignment store adds to your experience, sometimes it doesn't. It should increase your sim's job experience, and always has for me, but alot of people say it doesn't work for them. I don't think any knows why, or has a solution. I would try deleting and replacing the consignment store register, and if that doesn't work try entering "resetsim *" (without quotes), and then if that doesn't work try deleting your caches. If none of that works, I'm afraid I don't know how to help you, other than a complete reinstall, which would probably fix it, but would be rather drastic for such a minor ( compared to other problems) problem.