Do we ever get a canon explanation for why the dinosaurs didn't stay away from the fences?
Animals kept within electric fences usually don't approach them again once they've learned that the fences are electric. You can usually turn off the electricity after a while, and the animals still stay away from the wires.
This is even mentioned in the Jurassic Park novel, after the electricity go out, as a reassurance that they're probably safe.
But they're not safe at all, the dinosaurs apparently don't behave like cows, goats, pigs, geese etc. They break out almost immediately. Why do they do that?
It's canon both in book and movie that the raptors attack the electric fences all the time. In the book, no reason is stated for it, but in the movie, it's said to be to test the fence for weaknesses. But all the other ones? Why did the T-rex put its front claw on the fence, for example?