PDF created in Bluebeam looks different when opened by Adobe Reader

Hi

I use Bluebeam software to create PDF documents which used to view the same with old reader software.  With the new Adobe Acrobat reader DC (Continuous release | Version 2020.009.20063 )the documents are altered (colours and patterns change and layers are lost, see below). Can anybody please advise how to prevent these changes?

Bluebeam

Adobe Acrobat

Regards,

Steven.