I’m having the same problem after the latest update (2.6.1.1), amongst a host of other issues.
The site this theme is used on is huge and has over 1500 posts in addition to posts on 6 other languages.
Asking someone to go change the background color of the element to ‘fix’ this is, frankly, ridiculous.
There are so many issues, I’m wondering if you’ve even tested it at all. Yes, I’m angry – this is the 2nd or 3rd time there have been disastrous results after an update.
Hopefully you can get this issue and all the others I’ll be posting in related threads fixed soon. Right now I have to roll back to a previous version of the theme and Swift Framework and hope I can find a way to preserve new posts that were made since the update.