I'm having a bit of trouble on the server I play on where the eye will work about 3 or 4 times to keep the animal inside, but shortly after the animal is just able to get out and roam free with seemingly no lag/teleporting out like the eye was simply unpowered by redstone. Triple checked it and it happened multiple times.

The animals I'm trying to contain are mostly from the Alex's Mobs mod and Exotic Birds, however default vanilla animals are still able to be contained. I'm thinking it might be because some of the entities are moving faster than normal. Still don't think it's lag though as I'm hosting the server and TPS is 19-20. Any insights would be very helpful!