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The third run of the reality series scored a 1.4 18-49 demo rating and 4.68 million viewers at 8-10pm, which is down 36% from last year's opener in August.
The Glass House matched its season low performance from last week of 0.8 (2.28m) at 10pm.
Fox continued to win Monday night ratings thanks to Gordon Ramsay's cooking shows. Hell's Kitchen was level with last week with 2.6 (6.33m) at 8pm.
MasterChef rose 4% from last week to 2.7 (6.45m) at 9pm.
NBC's two-hour finale of American Ninja Warrior climbed 11% to 2.0 (4.91m) at 9pm.
CBS aired a lineup of repeats all evening, with Two and a Half Men achieving the best rating of 1.6 (5.76m) at 9pm.
