You have made more than the requested number of cashback requests (on the app) but have not reached the next level yet ?
When you are awarded a certain level in the Shopmium Club, your previous cashback requests will not count towards your progress for the next level. Also, if you unlock a level by requesting your cashback for several offers at a time, only your next cashback request will start counting towards your progress for the next level.
In short, for each level, a new set of criteria will need to be met before you can level up and reap the rewards of the next level :)