Warning on Babies R Us/Toys R Us Diaper Deal

Just got back from a different Toys R Us to try this deal and it was a big failure.  After three different managers/supervisors were called over to try to figure it out, I was told I can't use both the coupons and get the $10 instant savings.  I decided to just bail on the deal.  I could have just bought the $10 diaper box and used the $6 off coupon, but at this point I was a little disgruntled so I just left.  Whatever happened to "The Customer is Always Right?!"

So beware if trying this deal that its success will depend on the manager on duty.