Strange letters only in reports (created by Axapta // MS Dynamics AX)

Hi Guys,

i discovered a problem with some reports of our company in Adobe Reader (Version 2020.006.20042)..

i attached a screenshot of the behavior.. perhabs you could help me! 

the reports are created in Axapata (MS Dynamics AX) with normal fonts.. (Arial).. nothing crazy.. 

i already tried to reinstall Adobe.. resettet the font-folders... update all drivers and so on... but it won't work...

if i open these pdfs with Firefox, Chrome or another Browser, it looks good - no problem! 

but AdobeReader can't display these reports in a correct way.. 

Months ago, we discovered the same problem.. but windows updates and adobe updates solved the problem.. but now the problem came back.. 

Thx for any help!!

BR from Austria