Elastix inbound call occupied more channels - queue

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Dear Experts,
I am a newb in Elastix,
I have configured Elastix for all inbound calls forward to mobile numbers via the Elastix queue feature.
it was working fine. but for the last two days, it's making some problems. to fix that, when I am checking the number of channels occupied via core show channels its showing four channels occupied for one inbound call. I have attached a screenshot file. can someone explain to me why the app queue and app dial are down?

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