I use warnings plugin with PMD/Checkstyle/Spotbugs/Open tasks. I have one job on source code with one checkstyle error. Error is always datected but result screen sometimes show only part of log and sometimes show error details.

Source code is untouched between builds, console logs are identical (except times of course). 

When i run for example 10 builds, some has result ok some not. I think there is some random secret bug which sometimes throw result away..

I think (i am not sure now) that result on past job was sometimes showed ok sometimes not. So i think that random bug appears in time of showing detail screen.

I attach 2 result screens of same job - one ok, one not ok.