Wordpress Expert needed to help fix this weird URL issue

I have this strange issue where "?attachment_id=" archive pages are being indexed by Google on my Wordpress blog, and somehow, bypassing Yoast SEO completely. If I Google "site:automoblog. net inurl:attachment_id" I get 143 results. Here are a few quick examples: https://www.automoblog. net/page/26/?attachment_id=yebmnwdpdr https://www.automoblog. net/page/35/?attachment_id=vmmtlqhsgsk https://www.automoblog. net/page/28/?attachment_id=pejilxku When clicking into the pages, They're typical archive pages (although showing different posts than their non-'attachment_id' pages). They are also bypassing Yoast, because the titles of the pages are the Wordpress title settings ("Site Name | Wordpress Title | Page XX") instead of the Yoast setting ("Site Name - Yoast's Title Setting") I've used the Health Check plugin to disable all themes and plugins and it's still happening, the pages are still there, so I don't think it's a theme/plugin issue, and after reviewing htaccess it doesn't seem like that either. It's possibly a Wordpress file's weird setting in wp-settings or wp-config, but I can't find it. I could block them from being indexed with [login to view URL] but my main concern is about why they're being created in the first place, and why I can't fix it. Please help! Thank you, Chris