Pressure the buttons on my hoods, to select the next page on the head unit, moves two pages.
Not on the 830, nor 1040, just my 1050 ....
I've had the same problem since last summer when I started using the 1050. It doesn't always jump two pages, only when I press the hood button after a long delay. After that, only one page scrolls, until the next long delay. I'm not exactly sure what this timeout delay is but seems like it's several minutes.