Hello!
That is title/description markup syntax leftover from Yoast SEO after migration. We listed it as one of the caveats, but it’s easy to workaround.
Solution 1:
If you only have a few pages, scroll through the post/page edit overview. On the right side, you’ll see the SEO Bar with red markings. When you hover over it, you should see a warning.

You can quickly resolve this by clicking “Quick Edit/Edición rápida” below the post title, and empty or replace the “Meta Title” input you’ll find there. Hit “Update/Actualizar”, and the warning should go away in the SEO Bar.
You can also update the titles and descriptions from the page-edit screen, under “Entrada SEO Settings”.
The Meta Title input field should depict exactly what the title will become. Make sure it’s to your liking ??
TSF will ping search engines after you update the pages, so the erroneous title outputs should be rectified from search engines within a few days.
Solution 2:
If you have thousands of pages, then you may want to resolve the issue programmatically. When you find the time later, you can fix the titles and descriptions.
You can find an example snippet here: https://github.com/sybrew/the-seo-framework/issues/420, which you can add to your (child-)theme’s functions.php
file.
We’re considering adding those transformations to The SEO Framework. However, we don’t want to make our users rely on those syntaxes blindly.
I hope this helps ?? Cheers!
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This reply was modified 4 years, 7 months ago by
Sybre Waaijer. Reason: typos