Why is music randomly downloading from iCloud when I switch back and forth from "Show All Music"?

My entire music library is on iCloud, which is how I initially loaded my iPhone 5s with music. I originally loaded it with roughly 1,100 songs. In everyday use, I have the option "Show All Music" turned off. Periodically, when I want to add songs to my phone or listen to other songs in the iCloud, I turn "Show All Music" on.

It seems that every time I switch the "Show All Music" button on and off it adds about 30 songs to my iPhone which has spontaneously increased to about 1,600 songs. Is there any solution to this?