Light circuit has a shared neutral. (As mentioned previously.)
Your fencer is designed to leak current to ground. That is what a gfci is supposed to detect. Try unplugging the electric fencer.
Other than those two thoughts, reduce the circuit till the problem goes away. [unhook sections]
I trust you are using at least 10 gauge wire with the 30 A breaker, the current interrupting device is sized to the wire.
"Sub panel grounded at the barn"; I can read too much into this description, I don't think you want to "ground" sub panels... and there are specific code rules about sub panel distance when to employ grounds.
At this point I would be consulting a real electrician...
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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