I had the same issue for the game on 1/11/2020. Only explanation is that it is my dad's birthday and even though he has been dead for 20 years he brought some ghost buddies to the game, that or there is/was a bug.
Date Opponent Bleachers Lower Tier Courtside Seats Luxury Boxes Total Attendance Game Type
1/18/2020 Dog River Riverdogs 11447 1240 295 18 13000
1/11/2020 Serenity Valley Browncoats 12591 1240 295 18 13000
12/31/2019 Clovis Knights 11447 1240 295 18 13000
12/24/2019 High Point Heroes 11447 1240 295 18 13000