Why is Dreamweaver scrambling, doubling, stuttering in code view?

Hello, I am using Dreamweaver CC 2020 and was trying to create a simple Html page to copy and paste the code into a website for a client. I do this every once in a while, and it's a quick way to write a press release, in code and save it for an archive of what I posted to the site (an asp Chamber of Commerce site that allows their members to post news articles.) 

I have always built the Html and then saved it as a backup in its respective folder and then copied and pasted the code to the Chamber site.

Tonight, every time I tried to make a correction to the code, edit it, or change things around--the code either scrambled, or jumped to another line, or deleted some of the text. After an agonizing hour of attempting to work around it, with continued frustration, I fired up my copy of Brackets and am now using it. 

Is this a recent, known bug?  The anomaly is certainly new.

Adobe CC since the beginning

Mac OS 10.14.6 Mojave

16 GB Ram

Dreamweaver Build 15196

Thank you, Maureen Mead