Title Errors

Hiya,

I just got a new theme and it seems that my titles are giving me some issues. So basically our old titles would appear like this on the site and on bit.ly:

Site Name | *post title text*

not they appear as: SiteName.COM » Just a bunch of random text here.

Above is the set title in the <title></title> codes. However I changed it back to the code from the old theme, but no changes. I’m not the brightest person so it’s probably an easy fix but would love some help on this.

I use Yoast SEO. Title rewrite is already on. General settings also have the same settings from before.