I ran your question by Coach Alyssa Clark, who manages the training plans, and this is her reply:
I just checked the mountaineering plan and it doesn’t show any of the workouts at 887 TSS. TP automatically calculates the TSS scores based off of the structured workout and the HR zones, so I would suggest she check her zones and then try reloading the plan. It shouldn’t be coming up at 887.
Let us know if that doesn’t solve the problem.