Why does the Intellij test runner count tests incorrectly?

At some point during a testing run in Intellij test runner, the "total" test count begins to increase (as though its finding more tests while running), but the summary displayed when the tests are finished shows something like this:

Stopped. Tests failed: 5, passed: 3090, ignored: 392 of 3825 tests - 4 m 22 s 836 ms.

I'm not the best at math, but pretty sure 5 + 3090 + 392 != 3825.

I see nothing in Intellij bug reports mentioning something like this, so I'm wondering if there might just be a setup issue on my part, or something else entirely...