Creating Reports with time frame Filters on custom fields

I'm wanting to create a monthly report in Wrike for tasks located in a "Leave Request" folder. But finding it difficult to get all the tasks I want on the report, because if the task doesn't fit the filter exactly it is left out.

Specially I am wondering how to create a report for a specific time frame, (e.g. Jan 31-Feb 28) from the dates in a custom field. 

Currently I have tried to set a filter on the custom field with the time from (jan 31, and feb 28), the two custom fields it would impact is "leave start date" and "leave return date". Since they are custom fields I have included a time frame on both those dates to try to capture anyone who has come or gone during that month. My question comes up for tasks that have one of the custom fields outside that time frame it filters the tasks out. Is there any way to be able to capture and/or filters on custom fields in tasks? 

Or any other suggestions :)