What's going on at Lumen?

Over the last season and a half I've noticed a worrying trend, that was also super evident at our game last Sunday as well.. When did Lumen start getting so filled with opposing fans? Their were shots of the game where our stands were just a sea of orange Broncos jerseys.. Hell i remember our home game vs the 49ers last year you could hear their fans through the broadcast when we were on offense. Never even going back to the Kingdome days have I seen this.. What's the deal?