Several of my friends have the same problem as me, much easier to help others clean and tidy than do your own space. I put it down to reduced negative emotional weight (to objects, to the activity, guilt of not doing it in a timely manner, repetitiveness etc) and greater positive emotion (helping others, building social capital, satisfaction from completing tasks, maybe a sense of superiority because others needed your help) when cleaning others' spaces rather than ones own. I just roll with it now and accept that it's a thing