Why does iThemes Security looks broken on my site?

Hello,

I have uploaded iThemes security on a bunch of site, but for one in particular it looks broken like the CSS hasn't loaded properly or something.

I have uninstalled completely and reinstalled but it continues to look the way it does.

I can't remember or find the thing to let you go in to take a look, sorry.

Do you know why this is happening, it makes me not trust that the site is really working, like something is broken.

Kind regards,
Michael