Sometimes, the checkbox on (for example) https://www.drupal.org/user/3632862/admin-content that would allow to select all the posts doesn't appear. Instead, a HTML comment is rendered before each row in the view.

Furthermore, the pager at the end of the list of posts doesn't appear.

I have not been able to understand when it happens, exactly. It could be related to the number of posts, but I could not say what the threshold is.
I verified it happens on Windows and Linux, independently from the browser used.
Comments
Comment #2
avpadernoActually, the rows render their fields in vertical, instead of showing them in orizontal, as they should.
Comment #3
drummThis is the theme’s mobile tables styling kicking in, when the content is wider than the screen size. We should either:
Comment #4
drummActually, I’m leaning toward removing mobile table behavior from any table with Views Bulk Operations. The styling is a bit broken, in addition to the select all checkbox no longer working.