SYMPTOM:
After having applied a dynamic date filter using the "Between" operator in Strategy Web 9.x it is noticed that the first date selected is not retained.
STEPS TO REPRODUCE:
1. In Strategy Web create a report in Tutorial and add a filter to it.
2. Qualify on ID, choose the "Between" operator and switch to Dynamic Dates as shown below:

3. After applying the filter criteria it is noticed that the first date selected is not retained as shown below:

CAUSE:
This is a known issue in Strategy 9.x
ACTION:
With Strategy 10 web, users can create such a dynamic date filter with 'Between' operate. Please upgrade to take advantage of the fix.