Fiddler session disappears after being shown

I am tracking an IOS app through fiddler as a proxy. And for some requests from the IOS app, fiddler will display those sessions in a flash and then those sessions are gone. It is against my common sense that why a landed session in fiddler will ever disappear. The only thing I can think of is that the response of the http session is violating the protocol? But the IOS app behaves normally with those http requests and responses. I did catch some screen shots for the http request while it is being displayed in fiddler, and here is how it looks like for each fiddler column: ``` #:76 Result:- Protocol:HTTP Host:184.102.xxx.xx URL:/someUrl/someHashCode Body:-1 Caching: ``` Does anyone know what is going on here?