I had my rifle equipped, I unequipped it and now it says I need 15 will, I have 30 will. This must be a common error because my friend got it too. Does anyone know the fix to this, or what exactly I should do?
Thanks.

You must have added mods to it that upped the will level.

Or, you may have switched a piece of armor that has a higher will feed or lower +will / +AA stat.

The biggest thing to wrap your head around as a new player is that a +15 AA +20 WILL pair of pants with a 35 will feed isn't as good as a +5 AA +10 WILL pants with a 10 will feed. (Concerning will, anyway. There are obviously other concerns if you need extra str or stam of course))