The chart uses same prices for every day of the week by default. If your prices vary during the week, please use the day filter.
The day filter checkboxes can be found at the left part of the chart above the room types list.
Untick the checkboxes for days when the selected pricing is not applicable and remember to update the pricing chart.
For example, if your weekend rates will be different for the period of August 1st-31st, untick the working days checkboxes and fill in the August rates in the pricing chart. The rates for the days you have ticked will be renewed automatically, while the working days rates will be left unchanged.