Typeface appears uniform in digital but is different weights when printed

[#1]

Relative newbie to InDesign here; thanks for your assistance. I've got a simple InDesign document that I've converted to PDF. When viewed in ID and in the PDF, the typeface looks perfectly uniform throughout. Yet when I print the document, some sections of the text are heavier than other sections:

(I turned it sideways to emphasize the weight; red dots indicate lines that are heavier.) I checked every variable I know of but so far the only thing changing from line to line is the kerning - everythng else appears to be exactly the same (color is uniformly black, 13pt font, all Constantina regular).  Any ideas why this might happen? Thank you!  

[#2]

Can you post the PDF file on Creative Cloud or Dropbox or some other service so others can download and test? (You can't upload a PDF file in our forum.)

[#3]

Check to see if you have any glyph scaling applied:

[#4]

Are you sure the text fill is all the same black—0|0|0|100 CMYK is a different black than 0|0|0 RGB? The heavier weight black looks like it is printing as a 4-colors—there seems to be a magenta fringe on the edges of the text. Is there any transparency on the spread?

[#5]

Hey all - apologes for the delay in replying back info on my own post!  And thanks for the questions. I actually saved it as a High Quality Print format, in Adobe 9.0 version and higher, and the different font weights went away.  No clue what caused it but once I saved it for 9.0 and above, the issue went away. Never look back... 🙂  Thanks again.

LL