There already has been a bug report about this but I can’t find it now.
I found a way to reproduce this problem.
- Start a build with multiple jobs, go to the build’s page
- Move from build page to job page
- Wait until the VM boots and logging starts
- Navigate back to build page while the job is still in progress – by pressing “Build #XX” in the header or the browser’s back button
- => The corresponding job’s entry now shows a counter that increases every second instead of the job’s number