I have 3 circuits in my panel
How is this panel being used?
This sounds like a sub panel in a garage or a shop.
grounds are twisted together
Are the neutrals and grounds connected to the same buss in this panel? This sounds like a 120V sub panel in a garage with neutrals and grounds connected at neutral buss. They should not be.
I removed that braided ground
Was that the ground wire a the ground rod?
Sounds like the braided ground wire between a sub panel and the main panel.
one circuit that has 52 volts
When you did that voltage check did you check on ground wire with the other two disconnected from the panel, or did you check one with the other two connected to the ground buss?
If you have two circuits come together in a box, grounds of both circuits will be connected. In other words if you have two sets of lights on different circuits, and have the switch for each set in the same box, the grounds will be connected. There are other situation where the grounds of two circuits may be connected.
If your grounds and neutrals come together a sub panel and you have poor connection in the neutral, either in the sub panel or the main panel, and you disconnect the ground between panels, then touch the ground and the box you will get shocked.