I agree, it looks like the bracket was bent to accommodate a different stem angle. Those brackets were made when almost everyone had the traditional "7" stem, so they had the correct geometry to hold the bag level, but if someone used it on a hybrid or mountain bike with a 90 degree or a riser stem, the bag would tilt upwards. It shouldn't be too difficult to bend it back so the bag sits level.

I have been successful with washing my nylon bags in the washing machine. I've washed bike bags, camera bags, and backpacks and had them come out looking like new. First I remove any hardware and stiffeners that aren't sewn in. Also remove as much of the loose waterproof coating as you can, although more of it will come off when you wash the bag. I put smaller bags, straps, and dividers in mesh bags so they don't get tangled up with the other items. Press any Velcro straps together so they don't snag. When the wash cycle is done, hang the bag to air dry. If the bag has internal foam stiffeners, I'll give it a few days for all the moisture to come out.