Hi, I think I might have a solution.
Have you selected the correct ‘instance’ of the usb that has windows on it to load first in the boot priority queue? You can change it in the bios. I had the same problem and just made the one with a little ‘u’ boot first. The font is a bit different and you might still have to format and create a new partition, but it works. (Hopefully)
Best of luck!