the reason there's weird characters is probably because the database saves in a different charset i have experienced this with MySQL and Swedish characters like åäö.
ether they are stored wrong in the database or you are extracting them wrong, but i wouldn't worry about this part.
the rest of the print you gave looks like testing phase entry's,
pretty much every database has this depending on the coder behind it.
when you build your application you have to test it you often do this with bogus data,
some don't truncate before they put the database live and also don't do any cleaning or maintenance to the database which is not that surprising on a site that is vulnerable to SQL injection.
you will often come across databases that have thousand of "hacking" or vulnerability test entry's.
this is because skids use scanners which will save all attempts in database.
