the FITS header tells a different story:
bias 0.032 ms: 100 1
dark 120 s: 100 1
dark 1.39852 s: 100 50
Flat: 1.39852 s: 100 50
Light 120 s: 100 50
The flat dark (1.39852 s, offset 50) matches up the flat frame, but the dark frame (120 s, offset 1) does not match up the light frame.
You'll have to capture new dark frames (120 s) with matching offset of 50. Delete the old dark frames (120 s) and the bias frames (bias frames are not needed).
As a workaround, I calibrated the flat frame only with the appropriate flat dark (1.39852 s). For the light frame, I did the subtraction of the dark frame in PixelMath and tried to correct for the mismatched offset:
Create new image: NGC_7380_Light_HA_120_secs_2020_08_07T23_34_05_034_cal
Then I calibrated the result of the PixelMath equation with the calibrated flat frame (only performing the flat field correction). The result looks OK, see appended screen section. This workaround is not recommendable, it only shows that with matching calibration frames everything will work as expected.