Why do I miss things I'm supposed to catch on my rounds?

You walk your rounds, but things you should catch slip past you. This usually happens because the rounds have become automatic. When your feet know the route, your eyes stop truly looking, and the whole point of patrolling quietly drains away. Seeing is not the same as looking. After enough repetitions, the mind fills in what it expects to be there instead of registering what is actually in front of you. You are not lazy or careless. You are experiencing the ordinary trap of routine, which dulls attention precisely where it matters most. Break the autopilot on purpose. Change your route or your timing so the path is not identical every time. On each round, pick one specific thing to check as if for the first time, a door, a window, a corner. Looking for something particular wakes the eyes back up. Small deliberate acts of attention will catch what a numb, habitual walk lets through.