I was asked by a friend to crop a phone photo down to passport size. I opened up the image, selected the Crop Tool, switched to Resample, set the DPI to 300dpi and the units to Centimetres. Passport photos are 3.5cm by 4.5cm so I tried to add those numbers, but the crop went really weird, it changes my inputs to crazy numbers. I couldn't get it work no matter what I did. In the end I made a new document 3.5cm by 4.5cm at 300dpi and brought the photo in and resized it with the document. Then exported it. In the attached JPEG the top image is a new document 3.5 x 4.5 cm @ 300dpi. The second image is when I activated the Crop Tool. The third when I set it to Resample the dpi to 300, units to Centimetres. When I try to add 3.5 and 4.5 to the boxes Affinty Photo instead just makes them 62775.13cm and 413.39cm. At first I thought I was doing something wrong, but this seems to be a bug. I have tried this on my laptop and desktop machines, which both run Windows 10 Home, same results!