Goats are clever. If they find a gap anywhere, no matter how small, they will go through it. Get up next morning, and off they go again. Sheep are the same. Also at this time of year they are desperate for branches, grass, anything they can get, and they do not mind how they get it!!
Once the weather is better, and the grass and leaves come through, they will have better things to do than escape (hopefully!) I have spent a fortune on fencing goats in, and have still lots more to do.