Our full pipeline job runs across 5 different platforms, and apparently this confuses the Warnings plugin.
Each warning category appears multiple times in the sidebar.
They also appear twice on the status page. The counts on all of them are different, almost as if the same warning is being counted multiple times. For reference, the actual number of warnings in this build is less than 5,500 if run on one platform, but the lowest number displayed here is 15,124.
When you do click through one of the warnings, you get the first one listed--even if you click on one of the other ones with a higher number.
The "fixed" count is the same as the highest shown number, but then when you go to the previous build, the number of warnings shown on the same page is the lowest number again, which is inconsistent as the number of "fixed" warnings exceeds the total number of warnings we're being told about.