Your first post was a completely different error message. Please don’t mix different problems.
The floating point error message comes from an UPS what produces no good data on the SNMP output and the last on is a switch with wrong implemented PoE MIB.
First you have to inspect the output of your devices. That is not a CMK 2 problem but more a generic problem with your devices. For instance if the switch is not PoE enabled but it has the capability then this error can be normal and you need to configure this check as an “forbidden” check for this device.