Hmm, worst case you can clear the concurrency limits from the work-queue and then recreate it, I'm pretty sure we're working on some visibility improvements around this, it's odd that you wouldn't be able to see any of the running flows, you might be able to query for running flow runs from the api as well to see if the UI is missing something for some reason. It definitely sounds like this could be a bug if you can put together a Minimum Reproducible Example it may be worth opening an issue on our github repo as well.