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Why would I be getting "LEN 1 (Malformed Packet)"... "(Malformed Packet: RTCP)" on UDP Packets - Ask Wireshark

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We are communicating across separate VLANS with a Router in between, and can access field switches and successfully ping all field devices. The system manufacturer notes that they are seeing UDP traffic sent out by the system server, but that the server isn't receiving responses. I ran captures in Wireshark with the following results. Any idea why UDP packets would be reported as "Malformed" ... "Malformed Packet: RTCP"? Any help would be appreciated. Capture included.

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