.eml rendering issues

Hello! I have had great success using the email editor (it is very helpful for generating html / pdf receipts for travel expense reports!). For some emails, however, things do not render correctly when I load the .eml files downloaded from Gmail - background colors will sometimes end up off and there is no clear way to fix that within the web app. I have just discovered today that saving the .eml file as in .html format and then opening it in the HTML editor (curiously) causes the formatting to revert, but this seems like a kludgy solution. I would love any insight that could be offered, and would be happy to include images!

@no_season

Could you please the source, output and some screenshots highlighting the issue?