Combobox with pagination giving error while doing reload.

I have a combobox with pageSize pagination: 20. And I have a checkbox that serves to filter some records of the combobox. The error occurs when before marking the checkbox I navigate between the pages of the combobox, and when doing the reload it sends to my controller.cs the parameter start: 20, but when I make the filter it does not have 20 records hence it is without information . I would like to know how and where I can set this start: 0 property when doing the reload of the store that populates the combobox.