It might be to do with how PHD manages guiding and also whether you use dithering between exposures, I don't use PHD so can't say how it's internal programming works but I use other guiding/sequencing programs that use different methodologies
#Drifting towards the stars software
There is differential flex between the guide scope and imaging scope, I can imagine that with large reflectors there could be quite a bit of movement during a long sequence of exposures, the guide software is keeping the guide star located precisely at the same coordinates on the guide camera sensor but the main scope and camera is no longer pointing to the same place it did at the start of the sequence (mirror flop, tube flexure, temperature changes etc), this should not be the case if using an OAG without a separate guide scope of course. There are a few possibilities I can think of.
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