Why I see the number (Quantity) of my products decreasing... ?

:thinking:Every time I controle the number / quantity of my products in my store I see that it decreases What is happening ???  Is there any explanation? 

I really need to know what is happening… this is not the first time … WHY :angry:

Is it happening to anyone else ? 

I can scroll through 303 products in your store. How many do you think you should have and are you seeing the difference in your public storefront or back-end?