Symptom
If the option Follow rules for googlebot is set in the settings under Onpage > Analysis management > example.tld > Advanced > Robot settings, then more pages are found and crawled in the analysis compared to the setting Follow rules for *
the robots.txt file contains the following text:
User-agent: *
Disallow: /
Cause
The XOVI crawler is blocked by the robots.txt file.
Solution
Adjust the robots.txt accordingly to allow the XOVI crawler
or
Log in to suite.xovi.net
navigate to Onpage > Analysis management > example.tld > Advanced
Set the Robot setting option to Ignore instructions for robots
click on START ANALYSIS WITH CHANGED SETTINGS