Unable to change size parameters when resizing in Gigapixel

I am trying to upres an image to 120 cm. I enter that value in the correct field. That value then registers in that field. But when it then actually resizes, it always resizes to 251.46 cm. A completely arbitrary number. Same for several images. I also cannot get the resize factor at the bottom of the screen to change. It’s frozen at 5.46 I believe. So WHAT is going on? I have successfully used the resize function many times in the past.