Hi Robert,
I already reported it to our supporter, but he said it is working fine with him with no issue related to the web app builder, and I found that the issue persists to exist if we define the coordination system at the WAB as shown in the attached, then if we edit the map, the effect will not appear on the web builder.
Also it will be kind if you report it from your side, too.
Best,
Majdoleen