Extracting the backup _dir folder via 7-zip shows multiple numbered folders in public_html

I don’t know how to explain my problem more clearly.

I only choose 1 website when backing up. So 1 server. There is a simple Wordpress installed.
It shatters its public_html folder.
I `m talking about this.
There is not more than one site involved.
There isn’t a huge amount of data. (100MB)

It even shreds the backup of 1 site.
That’s my problem.