Agent Review Deep vs Quick?

Hi,

Been using agent review for a while but the docs leave you in the dark. I noticed that I run deep mode twice and no bug is found, then I run quick and it finds a bug… Whats the difference here? also it seems theres always just one or two bugs being found. You then fix it, run review again and it finds another one, or two. Bugfixing this way takes forever. How is everyone dealing with this? The feature feels useful but I would like to understand it better.

Thanks
Daniel