I don't think so, check your bench coverage. Also, I had some spawns that will spawn just off shore and come up from the waters edge into my base or even spawn outside the wall and moat and then walk around the wall and up from the water. Your base on the coast? If so, that could be part of it. You can stop them from spawning on the waters edge by using benches, but I haven't figured out how to stop them from coming around and getting in around my ship yard. If your not on the water anywhere, check those benches. I once had boars spawning inside the base and figured out is was because I had moved a bench during a re-modelling project and that left a gap where they were spawning.