Ask the Experts / Underground Entrance Problem

Hey guys, hopefully this is the correct forum but I've got an issue with an underground entrance I'm using on a park. The entrance building itself isn't undergound but the path leading to the park is and the peep entry point is on that section of underground path (the screenshot shows this), anyway the peeps that enter then leave the park don't seem to be able to leave the map they keep walking up and down the two map tiles outside of the entrance. 

 

I was wondering what the issue is and if there's anyway around it, also there doesn't seem to be many new peeps coming to my park, I was wondering if/why peeps wouldn't enter the park as they are supposed to. 

 

Thanking you all in advance. 

 

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It looks like you own the tile at the map edge, so guests can't use it to enter or leave.

Try building a path above ground over the exit, using 8cars to first de-own border land, then again to own all land. The above ground path will keep the tile from becoming owned.