So last night I went to do some measurements and for some reason REW was showing that my input was about 20 DB hotter than what my SPL meter was saying. this was both in the calibration screen and check level of the measurement screen. I double checked all of my connections and settings in my audio interface and could not find an issue that would be causing this. I closed and reopened it. I rebooted my computer. I uninstalled my soind card and reinstalled it again. But the problem persisted. So I finally uninstalled REW, deleted all preferences, and reinstalled. Problem solved. It didn’t do it again. This is not the first time I’ve seen this happen. any ideas? I’m running it on a Mac computer with Universal audio Apollo audio interface.