Photo Stream Photos on iPhone not downloading to iMac

I have Photo Stream enabled on my iPhone; my photos have always downloaded to my iMac with no problem. A few weeks ago I enabled iCloud Photo Library on my iMac and MacBook, but not on my iPhone. I want to just use my iPhone to transfer the photos to the Macs, with the iMac having the originals on it. Since I enabled Photo Library, none of the photos I take with my iPhone are transferring to either the iMac or the MacBook. Photo Stream is on in the iPhone settings and photos do transfer to my other iPads (which also have Photo Stream enabled) but not to the Macs. The settings on the iMac have iCloud Photos checked off and download originals to this Mac enabled. Is there something I'm missing? Please help.