Why is reported Free Space different between Home and Capacity Usage?

Clearly not terribly important, but simply why?

Screen Shot 2015-01-03 at 11.27.31.png Screen Shot 2015-01-03 at 11.27.41.png

Hello and welcome to the community,

Have you try a reset and/or power cycle?

Thank you.

It is the same after rebooting.

And, FWIW, it has now finished its 2 days of indexing - so all is silent and the delta remains…