It will not be the first time, but it is not very common.
To Coinomize and YoMix - this is not normal. In fact I can't remember the last time I saw a campaign manager get a sizeable portion of funds and then lost/stole it...
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Should an escrow be liable for any loss of such funds and get tagged till such a repayment is done?
Yes, he is responsible for these funds. If he loses them he has to bear the consequences, even if it is in this case as it seems due to negligence and not because he stole them himself. At the moment he has one negative tag and two neutral ones reflecting the situation, when not even 24 hours have passed. I think both tags are acceptable. Neutral which will change to negative if he does not pay what he owes or conversely, negative which will change to neutral if he pays.