On russian subs the active sonar is next to useless. American subs have interlaced display, which helps to see the contact against noise. FFG uses averaging, with even better results.
Subs needs stealth anyway, pinging says 'shoot here'. Active is good for FFG, but you better be fast with attacking, especially if you use LWAMI.
I think the fact you can hear active return, but you can't see it, is simply bug. You can never hear weak return. In no situation. Return volume is always the same. And it should not be.
In situations where you can hear but not see, it is not the display what is wrong, but the sound.
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