2.If the image request is being sent successfully then check if you can see the parameter "ts=". This parameter is the manual timestamp set in the app.
3.Phone clientcare and ask if the report suite to which you send the data to is timestamp enabled.
4.a.If the report suite is timestamp enabled and there is no ts= , then either you need to enable offline tracking in your app ot disable timestamp in report suite.
b.If the report suite is timestamp disabled and ts= is present in inage request then enable timestamp on report suite.
5.If #2 #3 and #4 are correct then check the version of the library that you are using. If you are using 4.x all the data is sent via context data and processing rules will have to be enabled to populate the right reports. The SDK uses context data and processing rules to map your app data to Analytics variables for reporting.
If you do not know how to read the image request post it here, we will be able to help