If the total is just over $25, both these offers can't be used at once. This is probably by design, but still the offer is not true.
So an order of $26.37 will either end up costing $25.76 with the $5.99 shipping added, or $26.37 with free shipping.
In either case, it's cheaper than normal, for sure, but just wanted to clarify the end result. In other words, you "save" much more by having the order large enough to not dip below $25 once both offers are applied.