Further to what MB said, as you still have a low feedback score you probably still have listing limits. You can check on your my eBay selling page what limits they are. If you have a listing limit of say 50 per month, that's all you can use, regardless of how many free listings you get from a store. The limit includes sold items. So, if you list 50 and sell 5, you can then only have 45 listed. If those 45 carry over into the next month, you can then only list 5 new items. I hope that makes sense!