贝宝IPN，在更改帐户中的IPN url后没有收到所有的事务响应

I am implementing ipnlistner inside my project. I set the ipn url inside my paypal account. But i am not getting all the transaction ipn responses to that url. But when i am checking ipn history in my account it displays that all the ipn has been sent. For example yesterday it is showing all 112 ipn had sent. but i am getting only 7 in my db. Here is my code for ipn listner. I am inserting all the data i am getting in the db at the first line only.I am implementing ipnlistner inside my project.