I didn’t change the content, yet my SEO score changed

In Yoast SEO 10.0, we recalibrated the SEO analysis. This changed several assessments, which may now give a slightly different SEO score for the same content. You can read all about the recalibrated analysis here: https://staging-4.yoast.com/yoast-seo-10-0/.

Keep in mind that the SEO score will only be recalculated when the post or page is updated, whether with or without changes.