I’m seeing this too, FWIW
I’m getting the same error. I’m using the latest version of Google Chrome / Windows 10.
Description: SEO Title and META Description form field errors. Cursor jumps back to the beginning of the sentence you try to type. Unless you copy/paste an entire line of text from another document into the field, there are issues.
Attention developers: To recreate this error you may need to create a completely new post. So be sure to first fill out all of the default WordPress fields for a new post AND THEN try the YoastSEO features like META Description. In the test I did, going directly to the YoastSEO features first did not reproduce this error.
A bug report is currently open for this issue. If you would like to follow the progress of the report, you can do that here: https://github.com/Yoast/wordpress-seo/issues/11644