My sims won't go inside their house when they come home

When my sims come home from off their lot, they never go inside the house. They just stop in the yard in front of the house. The front door is properly designated as the front door. That was the first thing I checked.

Here is a picture of the front of their house. The fence is there primarily to keep out the paparazzi and other unwanted visitors. I put in a regular gate and locked it to everyone except their household, because a celebrity gate looks out of place in their neighborhood.

https://i.imgur.com/LGczfOz.jpg

I replaced the gate with a celebrity gate for a while, in case it might help, but they still wouldn't go into the house when they came home. I tried resetting the door and the whole lot, but they still won't go into the house when they get home. But when I removed the gate in a test save, the sim I tried it with went into the house, just as he should have.

But here is the house they just moved from:

https://i.imgur.com/WWwkvKe.jpg

As you can see, it has the exact same kind of fence and gate, and the gate was also locked to everyone except their household while they lived there. And they always went inside the house when they came home from somewhere.

Can anyone think of any reason why my sims won't go inside their house when they come home? I would really like to get this fixed.