Mermaid scales and tails not showing up.

I got Island Paradise a few days ago and have been fighting with it since I installed it. I have the common lag/freezing issue that I never had before installing Island Paradise, which none of the suggestions I found online have fixed (Deleting the Scott family and house, installing overwatch, etc.). I went into Sunset Valley and successfully built a custom dive lot and island for a mer-family to live on, but when I moved the family into the lot the game completely glitched and dropped them in the middle of the town, needless to say I quickly gave up on that idea and went back to the glitched Isla Paradiso. In all of my Island Paradise games none of the npc mersims have had scales or tails, as the OP said. Not a huge deal for me since my sims could still have their tails and scales, but a little bothersome and takes away from the major reason I was still hanging onto the hope of getting Island Paradise to work. I have no custom content (and never have), and only just installed overwatch today, but the mermaid tails problem was present before installing the mod. I know EA is more preoccupied by the Sims 4 right now, but I still paid good money for this expansion pack which is turning out to be extremely bugged and it would be nice to have it work correctly.