Try physically unplugging all meters, except one. Does this single meter now function correctly?
If so, most likely your circuit has exceeded the common mode input voltage range of one or more of the meters, or you have inadvertently dragged the reference voltage down, (characterized by the meter under-reading the expected value). Now try plugging the DPMs back in, one at a time, until one or more fail to respond correctly. This should give you a pointer to the problem area.
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