Here is my post from another thread:
The same thing happened to me and the Genius bar did a reset yesterday. The problem appear fixed... Until today. Back to the Genius bar this afternoon. I'm not going to let them do another reset this time if that's the only thing they have to offer.
The Apple store tried all different things without success, so they gave me a new iPhone. They restored everything back via iCloud onto the new phone. Checked the shortcuts--the problem still exists! Blank.
Now I'm supposed to go back for a full hour appt so they can manually install everything onto my phone from my saved laptop. I may not do that and just live without the shortcuts until an update is available.
They said they've never encountered this problem before, but will submit it as a case to Apple.
My suggestion is that everyone having this issue to report it to a Genius Bar and make sure they submit it to Apple. Hopefully then Apple will fix this glitch on the next software update.
I'm almost 100% certain that this bug is caused when you have entered a shortcut which contains a single quote in it. I managed to half get my shortcuts back by entering a new shortcut with a single quote, but now it's broken again. I don't think there is much more that can be done until apple fixes this.
See my thread for more info: