Excel web app 2013 - simultaenous use filtering issue

Hi

  I have Office web Apps 2013 with SharePoint 2013 on two different server in same domain. for co-authoring on excel sheet. all is working fine. But i have one issue if two user login on site and edit same excel sheet by Office web apps. and one use is filter the column that time same filter is apply on others user sheet. how can i stop this filter to apply on other user sheet. Or  how can i fix this issue. Or how to two user will filter the sheet without reflating the filter each others. there is any way to do this.

thanks

navaratan

Navaratan Sharma