Phantom charge

[flyingperson23]

I'm having a weird and slightly concerning problem. Yesterday, I ran my coil at high power for a bit and turned everything off to check component heating. I have 10k power resistors across both the bridge output and the bus, but checked to be safe and both were pretty much empty (MMC 0v, bus 2v). But when I touched the primary to check its temperature after the coil had been off for at least a minute, I got a little shock. I put a metal rod across the ground strike ring and primary and there were a few sparks. Today, I caught it again. I checked between the primary and the ground ring and got 140v dc after about 2 minutes of being off, slowly dropping over the next few minutes. I checked the mmc and bus cap repeatedly and both were fully empty. This feels like my lack of electronics knowledge, but I can't figure out why it stores that much energy for that long after being discharged.

edit - I forgot a capacitor. I have a 2.2 uF mkp between negative bus and ground. Is this a likely culprit, and is it appropriate to put a discharge resistor across it?
Thinking about a discharge resistor, I'm a little concerned about it failing. If it fails short, a ground strike would probably kill everything.
This also made me think about the capacitor in the first place - as far as I know, its purpose is to couple a primary strike to ground, but does it not also couple ground strikes to the bus?

[Late]

edit - I forgot a capacitor. I have a 2.2 uF mkp between negative bus and ground. Is this a likely culprit

Yes that most likely is the reason for the shock. I'm not if putting resistor across it would cause any issues but i think that if the value isn't too low (like 1-10meg) it shouldn't. And I've never seen a resistor fail short. They usually fail open