It appears that you've got a scaling option incorrectly configured. After pressing Ctrl P (or File > Print, or whatever), there must be a 'Scale' option, or something similar there somewhere in the dialogue box that you see. (You might need to click on something like 'Properties' first). There should be options there, such as '100%', 'Default', 'Fit-to-page', etc. Check that you've got the right one selected. (If in doubt, trial and error is probably you best way forward).