webstyle rendering failure in 2018

I’ve tried to submit this, but feedback keeps crashing on me, so I can’t file a bug report. My background webstyle is being rendered strangely in 2018r1 and 2018r1.1 Please see below:

2018:

2017:

File the report without the attachments and then add them afterwards.

Thanks: 52419 - webstyle rendering failure in 2018.