Mentions_timeline : missing few reply tweets

[DemoOcms]

Hello Twitter Team,

I’m trying to use Standard API to get all the mentions_timeline tweets, When i execute below API url from POSTMAN, it shows only parent/main tweet but reply tweets are missing. I’m i missing anything ? or do i need to activate anything?
https://api.twitter.com/1.1//statuses/mentions_timeline.json?

here is my account details
Owner : DemoOcms|
Owner ID : 994496848990621696

Please let me know any settings in application level is missing. Also, im able to get Direct messages

Thanks you
Prakash