When you have the option to use a filter in Lifesycle, whether it be in the property search, viewings page or sales progression, you may see a number that shows inside the filter button like so:
This number corresponds to the number of filters you currently have active. For example, let's take the property search page filter below.
As you can see I have chosen Herne Bay in the Branch filter, Completed in the Property Status Filter, and Sales in the Type Filter. Therefore the number on my filter is three. Clicking in the sort section does not add or take away from this number as this simply sorts the properties in a certain order it doesn't filter them.