Why does it Completes test while still loading

I ran a test where page just made web service calls and waiting for response, but WebPageTest assumed thats completion of webpage load.

Am I doing something wrong in the webpage.
Page loads to completion from my computer
https://www.webpagetest.org/result/210203_Di80_b782e8ac8f1d77ff47152f7f9c88c997/