My old battered DT200 has had the same issue the last few months.
1 probe OK
2 probes I get wildly weird readings - super high temps on one and super low on the other.
It fixed itself for one battery change, but the problem is back for the last few batt changes.
Funny thing is I started having the exact same problem with an el cheapo from Hong Kong. Been using separate probes for things.
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