Audio recording issue on xh2s

[phantomcamera]

Hi everyone, hopefully there is is someone out there that has experienced this before me and has a solution

I've recently purchased a Camera Foundry Cineback in an effort to streamline my setup a bit for video recording. Before I was using my XH2s and a Tascam Portacapture x6 with their own internal power sources but with the Cineback I'm able to connect the two devices to the same battery via USB-C. My problem is discovering that when both the XH2s and the X6 are plugged into that shared USB power source, I get a clicking/popping noise on the recording and headphone output from the XH2s. The output from the Tascam is clean on both the headphone out and the actual line output I'm using the feed the XH2s. This isn't necessarily confined to the Cineback device either. I have a USB power supply that plugs into the wall with dual USB-C outputs and I get the same audio issue when connecting the Tascam and Fuji to run off that power souce. If I use two different USB power supplies, either a second "wall wart" or running one from the Cineback source and the other from the wall, I have no issues. I've also tried replacing my Tascam recorder with a Zoom F6 to see if there was an issue with the Tascam device, but I get the same problem with the Zoom F6. Is this an issue with my XH2s? Some sort of ground loop issue? Any help would be appreciated!