Stray electricity from fence

I didn’t know how else to describe it. I have a 6 joule electric fence with 5 lines covering maybe 1/2 acre. Kind of overkill but furry predators walked right through the the 1.5 joule.
Anyway I have feeder pigs I have 1 line encircling the inside of  their outside panels area. I noticed a pig laying in a mud puddle and at first I though she was coughing but then realized she was getting a little shock in the puddle. Not enough to hurt but maybe uncomfortable bc she didn’t  stay in it too long. I then went around to make sure the wire wasn’t touching the hog panels, noticed one panel pressed up against a ground rod.( my ground rods only make it 3.5 feet down before solid ledge and that’s everywhere. So I put a piece of wood between the rod and the fence. I still see a frog in the puddle flexing with time with the tick of the energizer, what’s this from and how to I fix it. It has rained a lot this summer so everything is saturated.
Thanks for any help.

It seems pretty clear you are getting some voltage leaking from the conductor to the earth ground. I think it's possible that some stray currents are moving around in the soil.

Can you describe your setup? Plastic/rubber is a fairly reliable insulator. But wood is tricky, since it becomes quite conductive when wet.

I have a 5 line electric fence going around  less than half acre, I side that electric fence I have a chicken run and hog panels where the pigs have a large area to go outside into. Inside those hog panels I ran another wire on the inside to keep the pigs from pushing or digging under the panels. I have plastic insulators everywhere where the line touches a panel or welded wire fence I would put a piece of wood between the electric wire and my panel or interior fence. After I did that the hog panel didn’t register a charge on my fence tester. So wherever I did that change wood to a plastic insulator? Will that take care of it?
Thank you

The whole goal is to keep your hot energizer from causing secondary effects. This is a process of elimination, to find the leak. But yes, if you are having a crazy wet year, using proven insulators is the way to go. Then keep testing and observing. My 2c.

Thank you for your help!