We had issue with the java analyzer:
But it should have been fixed with the deployment of the v6.3! (which is deployed: https://sonarcloud.io/api/plugins/installed)
When did you perform this analysis?
BTW, the analysis is not really the same between SonarQ 7 and SonarCloud (Sonar security).
You might compare things which are not really comparable.
Finally, I noticed the number of Java files is not the same.
Is the code base really the same?
Did you compare the report upload times?
Best.