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When I edit a post on this site, I see all the checkboxes all look like in [THIS image](https://imgur.com/a/NFJAkBn)\–instead of being square, they are rectangle. In the Customizer, the icons that are normally round all become oval.
I have disabled all the plugins to see if it’s caused by a plugin. And I have reinstalled the themes and WordPress itself. Nothing changed the weird look.
If anybody has an idea what could have caused this, I’d really appreciate it.
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Learn to use your browsers inspector tool to find the styles causing it
Right click > Inspect, look at the CSS. Share your url if you need further help.
How would user-added CSS change WP’s editing panel—and ONLY the checkboxes? And yes, I have used the inspector tool, @ass_master_general @bluesix