I got my R2 on Black Friday, and I just got done putting it together a week or 2 ago. I plugged in the USB and flashed Marlin with no issues. Then plugged the printer into main power, and had three or four small issues that i have worked through with almost no trouble. When the printer is on only USB or wall power the display reads correctly for the hotend 20ish degrees. Then when power from both wall and USB power the displays reads in the neighborhood of 350ish degrees. Any ideas on what could cause this? This is before powering the hotend up, which I haven't done yet.