Printing works best with Chrome of met Microsoft Edge.
Most browser offer you the option to save a webpage as PDF. You do this by printing (Ctrl+P), then choose the Destination “Save as PDF”.
If part of a section doesn't fit, it's possible for the entire section to disappear during printing, and even take sections next to it with it. Check carefully in the preview if anything doesn't fit. Make certain that the last line on the page has enough room to show low loops, even if you don't use any letters with low loops.
These headers and footers are added by the browser. You can disable this in the Print dialog of the browser. Click to expand “Meer settings”, then remove the checkbox for “Headers and footers”.
Make certain you've selected the correct paper size in the General settings of the worksheet creator. Some phones and tablets ignore the configured paper size; try using Chrome or Microsoft Edge on a desktop computer.