there are some articles with 2 or more urls. like this:
1. /essays/technical-essays/180-technologies/247-megapixel 2. /essays/technical-essays/247-megapixel 3. /essays/technical-essays/technologies/247-megapixel 4. /essays/technical-essays/technologies/247-
what is this? why this happens? url number 3 is the right one.
why the url number 4 happens? there are a lot like this one.
google consule refers to this as "Duplicate title tags"
It is a known problem. There may be several reasons. Among other things, how have you made your menus. You can fix it by redirecting to the unwanted URLs.
There are several extensions that can help solve the problem. I have very good experiences with RSSeo from RSJoomla, which gives a good overview.