Different responses from diff SOAP versions for same server

Hi,

I have two versions of SOAP UI one is 4.0.0 and second is 3.6.1. I have SOAP project created, which is currently used for generating
SAML Art from an IDP server. Now when I see the response received from both the SOAP versions, I see the response different.
SOAP 3.6.1 has an additional tag coming in the response where as this tag is missing from the SOAP 4.0.0.
When the Http logs are compared for both the SOAP 4.0.0 and 3.6.1, the difference I see is that re-direct request on 3.6.1 goes as POST where as on 4.0.0 it goes as GET. Not sure why the difference.
Attaching the logs for reference. As said earlier, then server being used for both the SOAP versions is same.
The behavior of 3.6.1 is correct and the request should be sent as POST. Not sure what configuration is incorrect due to which request goes as GET from 4.0.0.

It would be great if someone can share their insights to get this resolved.

Thanks.