I am setting up a New Figma File to be output for High-Res print (300dpi). I am using a 13"x19" paper stock so I create my initial frame with the dimensions 3900 x 5700. I come to this frame width by multiplying 13 inches x 300 pixels which amounts to 3900pixel, repeat for height dimension.
The problem is, when I export at 1x the PDF, or PNG, the file exports to over 54 inches x 79 in. If I bring it into Illustrator the document size still registers as 3900x5700 in pixels, but if I change the ruler units to inches, it shows that the document size is 54" x 79". This is 1250 DPI, not 300 as I intended.
What am I doing wrong, or misunderstanding? Is my initial frame setup wrong?