I got a US Optics scope for dirt cheap that did not work right. It had been sold and resold.
I figured out that the adjustable objective had double pitch threads and was off 180 degrees.
I sent it back to the holy lands in CA and they fixed it for free.

Now the pre sets work.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps