What wiki would this be?

I first noticed it on my own wiki, but I have seen it on other wikis as well, such as DifferentHistory and AllTheTropes.

Seems to look wrong to me, but also likely changes to CSS element classes or something. Try to change the vector mode to use "Legacy" in Special: Preferences and see if that works.

I'm afraid that whether or not Legacy Vector is active has no effect on the elements in question.

I think sidebars look distorted is Extension:CollapsibleVector 's bug, and I found a task on https://phabricator.wikimedia.org that describes this issue.

I tried to fix it using CSS:

#mw-panel.collapsible-nav .portal h3 {
  background-size: inherit;
  padding: 4px 0 4px 1.5em;
}

I found the cause of the problem with the vector tabs here.

Terribly sorry, but has there been any solution so far? I tried putting in the JS code in one of the phabs posted in my Vector.js to no avail.

In T6365#125359, @Amelia wrote:

Terribly sorry, but has there been any solution so far? I tried putting in the JS code in one of the phabs posted in my Vector.js to no avail.

Hello.

I saw your Vector.css, and I found some issues in it:

• div.vectorTabs should be nav.vectorTabs (or nav.vector-menu-tabs)
• div.vectorMenu should be nav.vectorMenu (or nav.vector-menu-dropdown)
• .vectorTabs span should be .vectorTabs a

because in MW 1.35, these elements had been changed or deleted.

I think if these changes applied, your wiki's tabs may be changes a bit.

Thank you so much! It's not all there yet, the 'watch/unwatch' button and 'more' button are still not perfect, but it's better then before!