Problem with Emojis, looks transparent

When i send SMS with any app of messaging the emojis looks normal in my device and all normal, but in the device of the person has received my SMS with emojis, the emojis are not visible, check these screenshots:

My Nexus

i.imgur.com/aB1qXOF.png

the person has received my SMS:

i.imgur.com/e1DuOUt.png

whats the problem? :(

No root and stock rom

PD, Sorry for my bad english