CSS does not load while executing via katalon studio

I am trying to automate a web portal built using .Net.
I wrote a simple test case to navigate and login using a credentials.
When I run the script via Katalon studio, after login , the page css does not seem to load.
The entire UI breaks.
It works perfectly fine if I do the same manually.
PFA the screenshot.

This issue has been resolved by setting up proxy.
It was blocking CSS due to proxy setting.
I had to go to Preferences --> Katalon–> Proxy: Use system proxy and it started working fine.
more info on it can be found here:

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