Would you be able to provide a screenshot in which you are seeing days outside of your panel or table date range?
One scenario in which this can occur is if you have a range such as 'last week' - because the 'reporting window' for a week is actually a month you might see something like 'bounce rate' cause the preceding day to the range to be included in the table. This would be a result of a visit that crossed from one week to the next.
You may also wish to brush up on the documentation for 'Data appearing outside reporting window'.