Inaccurate amount of orders/ready to dispatch numbers

For the past few days suddenly my number of orders to complete/orders to dispatch numbers have been double that they actually are…

Its nothing to do with other regions or FBA, I only do seller fulfilled.

For example on sellercentral it says I have 30 orders, then under it or when i click on that I only have 15…

Then later on it says 32 orders… when I actually only have 16.

Very strange… does anyone know what is going on?