Could you please provide more details?
With two sets of bias, dark & light frames, each set taken at two different temperatures, after creating the two master bias frames and two master dark frames, calibrating the light frames showed only the corresponding master bias and dark frames in the Calibrate adjustment (in addition to “None"), as expected.
Please provide a more detailed description so I can replicate the steps you were taking.
If “Other” is displayed in the calibration list, this typically means that the selected calibration frame cannot be found anymore or otherwise became invalid. For example, you add the Calibrate adjustment to a light frame, select a master bias frame there, and then later remove or change that master bias frame.