I had a similar issue. I was messing around with Intel XTU overclocking my 10700K on the desktop via the application. In BIOS my settings were all set to auto except for Load Line Calibration set to level 4 and AC/DC Load Line set to 0.40 mOhm.
My issue was somewhat similar, I was experiencing high volts up to 1.45 volts when I should have been seeing 1.265 volts. And it turns out that because I messed with the per-core overclock multipliers in the Intel XTU application, it was causing weird behavior for my CPU.
So in order to reverse whatever I did with Intel XTU, I just uninstalled it, restarted my computer, and then reinstalled the XTU (I use Intel XTU for the CPU monitoring). Now my CPU behaves as expected.
Do you have any similar apps that allow desktop overclocking?