visual level filter

Hi Team,

I've a stacked bar graph visual in which Mon-Year as x-axis (eg: Jan-2016) which is a visual level filter and visits as series in the bar graph, this is also coming under visual level filter, now when i try to select  one particular value from Mon-Year visual level filter and also try to apply another filter like visits < 500 it's showing data of 1 series though in reality i have more than 1 series that's meeting that criteria.

Any inputs on this behavior?

Thanks,

Swaroop