SWEP Functions Running Multiple Times

[harmless]

Essentially I have a function:
function SWEP:SecondaryAttack()

local ply = self:GetOwner()

if(mode=="explosion") then
mode = "contagion"
elseif (mode == "contagion") then
mode = "explosion"
else
mode = "explosion"
end

ply:ChatPrint("TRAP MODE: " .. mode)

end
And whenever I right click with the swep it gives me
TRAP MODE: contagion
TRAP MODE: explosion
TRAP MODE: contagion
TRAP MODE: explosion
TRAP MODE: explosion
TRAP MODE: contagion
TRAP MODE: contagion
TRAP MODE: explosion
TRAP MODE: contagion
TRAP MODE: explosion
TRAP MODE: explosion
TRAP MODE: contagion
TRAP MODE: contagion
In groups of four
The same happens in the primary fire function:
function SWEP:PrimaryAttack()

local ply = self:GetOwner()
local target = ply:GetEyeTrace().Entity

print(target)

if(IsEntity(target) and target:GetClass() == "sent_airdropcrate") then
ply:ChatPrint("Locking onto crate...")
timer.Simple( 10, function()
armCrate(mode,ply)
end)
else
ply:ChatPrint("ERROR: No crate found!")
end

end

function armCrate( trapType, ply )
ply:ChatPrint("CRATE ARMED")
end
Where it prints
Entity [330][sent_airdropcrate]
Locking onto crate...
Entity [330][sent_airdropcrate]
Locking onto crate...
Entity [330][sent_airdropcrate]
Locking onto crate...
Locking onto crate...
(10 seconds later)
CRATE ARMED
CRATE ARMED
CRATE ARMED
CRATE ARMED
I'd like all of these things to happen only once if possible. Anyone have any ideas?

[harmless]

Awesome! Now we're down to doubles instead of quadruplets
Entity [0][worldspawn]
ERROR: No crate found!
ERROR: No crate found!
TRAP MODE: explosion
TRAP MODE: explosion
Entity [0][worldspawn]
ERROR: No crate found!
ERROR: No crate found!
TRAP MODE: contagion
TRAP MODE: contagion
Entity [0][worldspawn]
ERROR: No crate found!
ERROR: No crate found!
TRAP MODE: explosion
TRAP MODE: explosion

[YourStalker]

[b]DONT DO THIS![/b] Do not just chuck
if not IsFirstTimePredicted() then return end
At the top of your SWEP functions, it will break prediction. You know how you get real pissed off because you shoot a guy and there’s definitely blood spatter on the wall but the guy takes no damage? That’s because of this. The only thing that should be surrounded by that IsFirstTimePredicted check is the timer.

[harmless]

Perfect! To sum it up it seems like we were calling 4 times because it ran on client and server and there was a prediction for both. 1 * 2 * 2 = 4

[c👌de_g🎷]

You should also use a self variable instead of a local for the mode. Otherwise, all weapon instances will change modes when a single one secondary fires.