Where do the broken bytes come from on the page?

Question

MySQL

Hello, where are the broken bytes on the page that the validator finds? In fact, they are not visible, but the validator shows that almost the entire page is in them. Database in utf8 and the template itself
Where is it from?
Error: Malformed byte sequence: d0.
For example:
land in the city of Kuznetsk

Answer 1

SET NAMES utf8;sent a muscle? didn't forget? and the utf8 file encoding without BOM (as html-css correctly reminds us of the lost vigilance )

Answer 2

As Ivan wrote above - Set names and the table itself must be encoded in
UTF8-GENERAL_CI