Why do i get different apearnace when I use different addresses using Python Flask?

I wrote a Web based app using Python Flask. When I run it using the localhost address, I get the results shown in the bottom of the attached image. When I change the address to my PC IP address (and still running it from the same PC using the same browser), I get bigger fonts and skewed tables (the bigger font issue is shown at the top of the attached image). results image

I am using Python 3.6.4, Flask 1.0.2, Browser: Goggle Chrome.