Hi kris2125,
It is possible that you are further ahead in levels than you are in the quest progression due to collecting a lot of XP.
If you check out Wiki Simpsons, it will give you a rough idea of which quests have to be done in which order.
http://simpsonswiki.com/wiki/The_Simpsons:_Tapped_Out_quests#Level_15-20Please note, this a guide only, some quests may be given to you in a slightly different order.
I hope this helps you.