I saw the same in my images. Some have a Filter i Fits Header, others don't. This is with a new install, Kstars v 3.6.0 on a Raspberry Pi 4, ZWO ASI294MM with ASI mini filter wheel. It happens for Lights and Darks
Also, I noticed that the exposure time for Lights and Darks appears differently in the FITS header. A 300 s exposure time can be either
EXPTIME 300.
or
EXPTIME 3.000000E+02
Not quite consistent

I hope these issues get resolved

/Wim

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