Open Sans appears uneven in PDF but fine in Word

Hi!

I have installed the font Open Sans on my computer. Everything appeared to be fine when I used Open Sans in Word, but after exporting to PDF the font appears uneven in PDF. When opening the PDF in a browser it looks fine, but when I open it through Acrobat it looks odd.

You can see an example here of how it looks:

I have tried to delete and reinstall the font, I have tried variable and static version of the font. It simply does not seem to work.

Hope someone can help!

Thanks in advance!

Best regards,
Susanne