Welcome to the Forum @mpearson .
This is an issue that is known and a fix will be coming in a future release of the Server software. Sometimes it is so extreme it gives a deep green background. It is not an issue with the camera but with the way the calibration currently works.
Until the new Openflexureserver release there are some ways to get the calibration to work. First, if the calibration is not far off then simply re-running the calibration can get it correct. Sometimes it can take three or four runs. Second, sudo ofm reset sudo ofm restart will clear most of the calibration from the server and give the calibration a fresh start. Third, the issue can be reasonably reliably induced by reducing the lighting, so make sure that your lighting is well aligned so that the camera has plenty of light to work with. With plenty of light and a fresh server the calibration is pretty reliable.