see the field "Inventory in period"
where you have covered just 1 week
the year has 52 weeks.
If you do 12 counts a year, then you should have a period from 24.10.2014 to 24.11.2014
If you want count every week, then the range of just one week is okay, but then you do not need to wonder about an item which is not included in the first week, it can be in any of the 4 weeks of a month, depending on the last count date and the time past since that day.