Font appears visually as Myriad Pro in PDF, but in AI file its set to Open Sans
I received an AI file along with a PDF from a client.
When I open both files and view them side by side, I see that some fonts are displaying differently.
Both AI and PDF say the font is Open Sans (top line in image below)
But visually, in the PDF it looks like Myriad Pro (bottom line in image below)

I can't figure out what is causing this.
The weirdest thing is that if I examin the text in the PDF, even though it looks like myriad Pro, Acrobat says it's Open Sans

In the PDF Properties both Myriad Pro and Open Sans Semibold are listed under Embedded Fonts


Does anyone maybe have any ideas why this is happening?
Thanks
