You're probably not seeing a bug.
You're probably seeing the ambiguous contact.
When you add a contact you detected using the Towed Array, two contacts will be added to your map depending on the platform you're in. The TA sensor has no way of knowing which contact is the real contact so you need to turn your ship and travel a small distance to determine the real one.
The real contact will not change its bearing much but the ambiguous contact will shift bearing the same number of degrees your ship turned.
I think this especially happens in the FFG platform.
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