I got a new guitar recently and noticed it makes a very slight hum unless I touch something metal on the guitar. My other guitar doesn't do this, so it made me wonder if the guitar was improperly grounded or if it's just a side effect of higher output pickups. It's a LP style btw.

Anyone have any insight?
try to check if the ground connection is loose or just buy some shielding.
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What kind of pickups are you using? When I swapped some passives for my active EMGs I didn't properly ground things. Take a look inside and see if any wires are loose (there should be wiring diagrams for whatever pickups you're using somewhere on the internet) and if so, solder them back where they should be. If you don't know what you're doing with such things, I'd recommend bringing it in.

By the way, when you say your other guitar doesn't do this, do you mean if you unplug the humming guitar and plug in the 'good' one to the same amp there's no hum?
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It's a new guitar, just an Agile AL2000 with the stock pickups. Tomorrow I'll have to pull the pickups out and check the connections. I just didn't want to go through the trouble if it was probably something else.

And yeah, unplugging this guitar and plugging in the "good" one and there is no hum, so I'm pretty sure it isn't the amp or power source.