There's a bug in the Print module. Prints do not print as cropped on screen. It seems to only affect rotated images, here verticals, auto rotated to fit image cells. Notice on screen shots that the crop hasn't been maintained between screen/gui and print. It affects both Print to Printer and JPEG file, whether draft or not.
The partial pixelation on screenshots are done in post. Focus on the borders/cropping on the top most row on the sheet of 4 image cells. Notice the bucket and shoe are cropped differently between gui and print.
I hope you can quickly fix this, as it's frustrating not being sure my prints come out as intended.
Using version 7.3.1 of Lightroom Classic CC, on macOS 10.13.5.