"Chase" as used here has a specific technical sense in engineering; to avoid confusion it would have been better to simply call it a crawlspace, as that's the term commonly used in levelediting.
As to the problem itself: the irregular shape of the crawlspace may be a contributing factor, but I suspect that the core of the problem lies with faulty room connections. Check the elevation of the relevant rooms and see if they match up properly. Perhaps you raised or lowered some sectors after you've connected the rooms, resulting in such faulty connections.
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