photostream confusion..
photostream is driving me nuts. for some reason, 300 or so old pictures (ie 2005) ended up on my stream and hence on my imac, iphone and mini. I deleted on the iphone (only way I could figure was to actually tap on all pictures and delete..). But, they're still on my other devices. So, it seems that photo stream ADDS the pics fine across devices but when deleted on one device they are not deleted on the others. Currently my photostream is empty on iphone but still loaded on the mini. I thought this was the point- that all devices sync'd? What am I missing? Thanks.
iMac, OS X Mavericks (10.9.2)