So when you mention you heard two signals.... Did you hear two signals, one on 95.1 and one on another freq? Were you hearing two signals with same programming bleeding together on same frequency? Were you listening to 95.1 from an HD-capable tuner? (And perhaps the HD carrier was tuning it and out, and if so, maybe the HD version is offset from the original program source to begin with?)
Different situations could have caused the behavior you encountered. Kiss 95.1 itself should only have one broadcast tower for WFKS. There is, of course, also the chance you could have heard WAPE 95.1 out of Jax with a similar song on at the same time? ...Not really sure.
Byron