it sounds like you are in charge of the system.
There is no way to LOCK out other iPads from changing the show or snapshots.
Each and every iPad needs to connect to the router.
You could have saved yourself a headache by saving the settings on your iPad by either creating a new snapshot, or use the "Replace" option before they showed up and ruined your day.
SAVE! SAVE! SAVE!
You need to tell everyone who uses an iPad with your system to bring it to you before they turn it on.
Only after they have handed you their iPad, YOU turn it on and chose DL1608 (not iPad).
After you have turned on each of the other iPads, you should lock out every feature in "Access Limits" except the ones you want them to have access to for their monitor mix.
You do not want them changing EQ, channels icons, names, mutes etc.
Each one of the other iPads needs to be locked out so all they can do is change volume faders. "Access Limits" can block the user from many different things,
if the iPad is being used by a musician for his/her IEM, then they should have everything blocked in the Access Limits page (RED) on their iPad except their mix number and perhaps pan and mute.
Watch these video tutorials I did...
This one is all about monitor mixes...
https://youtu.be/SYR1eGEzG0gThis one explains more about View Groups and Access Limits.
https://youtu.be/mdeLHqp5QIUNo iPad except ones used by you should have the ability to change the show/snapshot.