Hi Kovin,
You should set 'Store request headers' and 'Store request bodies' options under Tools|Options|Engines|HTTP Load Testing|Simulation. This will make LoadUIWeb to store request headers and bodies to the log. After the test run is over you should examine the log and check that correct parameterized data were send to the server and that the server replied with correct response.
If the server was requested with correct data and replied as expected but the blog was not created, then either the problem is in the code executed on the server while processing the request from the client, or you missed something when sending requests from the client (for example not all required data were parameterized or test did not execute some required request).
