Transact SQL :: Add Where To CTE

Why is my where skewing data?  This 1st statement shows everything perfectly, but this go around Ineed to add one more stipulation and adding in the where returns 0 results.  But if I run a simple select with the where added, I get the intended result set.

--works
with cte as(select *, row_number() over(partition by time1, time2, userID
order by userID ) as rn from timetable)
delete from cte where rn > 1

--no work
with cte as(select *, row_number() over(partition by time1, time2, userID
order by userID ) as rn from timetable where timeadded > 0)
delete from cte where rn > 1