The last two times I ordered from rockauto my orde...

The last two times I ordered from rockauto my order was changed from a quantity 1 to quantity 4. The first time I didn't notice until my part and extra parts arrived. The second time i noticed right after my order placed i'm sure there was only 1 in the cart but my order showed 4. I changed it back to 1 but probably now my order is going to take longer. Please fix this.