Font size screwed up???

[Stalker61]

Was just working on a sig, no problems with it at all. Then I decided on a whole new idea and when I select my font tool and typed on the canvas, the text is so small I can't read it unless I edit the size up to 1880 pixels. I usually use the default sizes from 6pt to 72pt. But for some reason if I select 72pt, the text is way to small? What did I screw up and how do I fix it?

Please advise