All sidebars from single posts suddenly gone

edited February 2019 in Theme support
Hi,

on my website all sidebars for single posts are gone (for all existing posts as well as new posts)! I can't say when the issue has occurred the first time but it affects all single posts, regardless of the sidebar name. Even if I want to create & publish a new blog post I can choose any of my sidebars (which has worked fine before)- but it does not appear anymore. It's also regardless of the layout (left, right, both sidebars). No matter what I select there, the blog post always shows up with the full width layout. As "template" I choose the "Builder" like every time. 
However, it still works fine for pages, so the sidebar for pages appears! 
It can't be related to the sidebars itself, because if I choose a sidebar which works fine for a page, it does not show up anymore in the single post.

Example single post which fails (German blog...): https://isardomains.com/taeglicher-aftermarktreport-2019-02-23/
And this is a page where it still works: https://isardomains.com/tag/
BOTH are using the same sidebar.

Help! Please advice! How I can get my sidebars back?

Betheme version: 21.0.9
WordPress version: 5.1

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