Pipeline timeout and auto-cancel doesn't work

In our gitlab instance, we have a project that has a Timeout set to 20m and selected the Auto-cancel redundant, pending pipelines option.
Unfortunately, none of these settings work. The timeout is indicated as 20m, the job has exceeded it a lot, but it was still running. There was a deadlock and I had to kill it manually.
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The same with the auto-canceling pipelines. I did 3 commits on the same branch, all of them had a deadlock. After a weekend there were 3 pipelines still running for the same branch.

Is there any additional setting that may block those features globally?