[AX2012] Generating report PDF's: No bold text

Hi,

I made a custom AX report, containing different invoicelines.
The report itself works fine, excluding one oddity;

I can print the report, which works great, however, when I open the PDF, lines in bold appear as normal font style lines.

I am using the font Calibri.
I tred changing the bold property to all possible options, to no avail.

Am I missing something?