Receive a blank bubble on text on the IPhone

I got an iPhone and I always text this person. Everytime I text them, I get a blank text bubble on IMessage. How do I fix this. I ask them and they said they texted me back but it just shows blank on my iPhone. It only shows the bubble with no text. They receive my text messages.

I think he just texts you spaces.
Ask Apple?

He probably is texting you spaces, or the message is loading, or imessage may be malfunctioning. Do a clean restore on your iPhone, and then check and see if it still happens, but remember, back up everything on your iphone before you restore.