I had similar issues when using either Intel GPU enabled and set as primary, or connecting to PC via RDC (not using TeamViewer). After update to latest Claymore's miners, the issue with Intel GPU has gone for me.

The reason is (probably) that miner detects the 1st graphics subsystem and gets its temps. If it is an embedded graphics, you see single card. But for mining it uses another API which does not mix AMD/NVIDIA cards with embedded graphic. So it uses all cards, but temperature may be from another source.

You may try to enable/disable on the BIOS level embedded graphics, so your primary adapter is PCIe card and no embedded GPU exist in system settings. And use real monitor instead of RDC to check. This usually helps.