SNMP data reversed after upgrade to 15.1.1

Hi.  I upgraded a 5G 450 AP+SM's the other night from 13.4 to 15.1.1.  I noticed on our user connection graphs the dBm and SNR Uplink/Downlink values have reversed.  Is this a known bug/fix?  I probably noticed this a while back and since nothing was "broken" I didn't think too much of it.  Attaching a screenshot of my example.  No graphs were changed, only the version was upgraded.