XF 1.5 Changed domain of my site, and front-end css is broken


Active member
We've just changed our site domain from old.com to new.com. In the admin panel, I updated boardUrl and homePageUrl to def.com. All OK on the admin side, but front-end is still trying to load CSS/JS from the old.com. As you can see below the view source:

<base href="https://new.com/" />
<noscript><style>.JsOnly, .jsOnly { display: none !important; }</style></noscript>
<link rel="stylesheet" href="https://old.com/css.php?css=xenforo,form,public&amp;style=6&amp;dir=LTR&amp;d=1644867000" />

As we can see, the base-href is correct, but css.php is still belong loaded from the old.com!

Thanks in advance!