Thank you for your reply JJMack. In this case, I am not using Adobe Illustrator, InDesign, nor a Wacom tablet, just Photoshop straight up. Though I am on a new computer with High Sierra.
I have Photoshop CC 2017.1.1 running on my 2012 MBP/MacOS 10.13 I should mention there is a HS update already out addressing a problem with the APFS encryption password.
I can plug in the W x H x Resolution numbers and units and save them as a preset, then revisit that preset and the correct numbers are filled in the Crop Tool options bar.
I can suggest resetting the crop tool and if that fails reset preferences.
Hmmmm, I am also on a MBP (2017) and already had the update in place. I just tried both, resetting the crop tool and resetting the preferences. It definitely changed things around but unfortunately it made the crop tool worse. Now the numbers jump AND the px/in won't stick, reverting to px/cm unless I enter the letters 'in'. As well, after resetting the preferences, my workspace had a new look which I liked and decided to keep and I named it. When trying to delete the older one, it would delete the newer one. I needed to choose the reverse of what I wanted in order to keep the new workspace.
I'm sure there's more surprises to come....