Incorrect display of the Montserrat font (regular/bold) in Adobe Acrobat, white spots are visible

Incorrect display of the Montserrat font (regular/bold) in Adobe Acrobat, white spots are visible.
However, if you zoom in a bit (take a closer look), these white spots disappear, and everything is okay.
(The sheet was exported from ArchiCAD; if exported from other software, it displays fine in the reader).

Help with resolving the issue.