Iirc, the ADCAP moves at launchdepth (in the game anyway) until it reached the Enable-range. (or is manually enabled by the button) Then it dives/climbs to the set search-depth. So you probably had the search-depth set to the default which might have been above the layer.
Did it home onto the target at all, even though it did not detonate? That might be because the floor and ceiling depth were preventing it. It is not clear to me how you set those levels.
EDIT: p.s. If you use active sonar then you can expect the target to make evasive manouvres. So he may not be where you thought he'd be. Did you check with "Truth Layer On"
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