Hello Mac,
Animals can "teleport" to their home when they are trapped for some time. That would explain why they are not in the enclosed area at some point.
They can follow you and cross a gate right behind you if they are close enough to you, but they shouldn't be seen crossing walls or gates.
So if you have seen an animal crossing a wall or a closed gate (not being chasing you at a short distance) then there is a problem and I will need to check the place and try to reproduce it.
Thanks