The previous owner got very creative with the sensors on our two openers. It was obviously flagged as a deficiency when we had the house inspected, but one that is easily fixable.
In fact, I've been meaning to fix it (and clean up the rat's nest of wiring) since we moved in, but right now we are only using the garage for storage, don't have small children, and aren't in and out of the big doors on a regular basis so it's a pretty low priority for me on the ol' to-do list.
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The fact that the resistance sensor was turned up way too high was a bigger safety concern personally (If I stuck a 2x4 under the door it wouldn't reverse the way you'd expect it to). That one was adjusted as soon as we had closed on the place.