Turf Takeover often loads Pvzgw1 Garden and Graveyards

For the past couple months, when I play Turf Takeover, the map randomly switches to Gardens and Graveyards when a new game is about to start. Sometimes it happens as soon as I go through the portal. Other times it happens after I play a couple of rounds of Turf Takeover, when a new game is about to start.

The only way to go back to Turf Takeover is to leave the game and go back to my backyard. When it first started happening, it was maybe once every couple weeks. In the last two weeks however, it's happening every time I try to play. 

Anyone else have this problem? I have no idea how to stop it from happening.