ZOHO Rest API, some tasks are missing for some projects?

ZOHO Rest API, some tasks are missing for some projects?

Hi im trying to get tasks for all my projects, im looping index and range upto total task count. but for some of the projects  2, 3 tasks are missing but actually its shows it in task count. for example if i have 271(open+ closed) tasks for a particular project it returns only 267 tasks as response 4 tasks where missing, i cant find why this happening. can any one have any idea about this?. any one please help me. Thanks.