I would see if it will fill to correct level rather than flushing just add water by bucket slowlly, if it returns to that level like that its a faulty pan id say
Should be a 50mm seal on a pan so if you add a bit water and it remains at that level it is the pan at fault. Bit of a pain if you supplied it. Half shift lost running for another and changing it. If you got it from a merchant if you kick up a fuss (depends how well you know them) they may reimburse your costs.
Glasgow Tenement? I had a problem with loss of seal and found a birds nest wedged in the pipe at roof level. Otherwise could be the pan or wind blowing down the pipe. Try the buckets of water down it first. Try fitting a vent cap mate?
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