So far the problem was resolved as soon as I moved one of my Sims out of the first apartment. The second Sim is still residing in one apartment but the bats have stopped flying through the apartments at sundown. And these are the Stone Street apartments, not Stoneridge as I previously stated. I have had Sims living there before I bought SE and never had bats do that. I don't own the Vampire pack so that is why I believe it is a glitch that came with SE since there is a cave with bats on the mountain. Thanks so much for all the replies. :)