Simulator css working but real device css partially working in ionic angular

Please help me guys i am facing one major issue while building application.

I am using ionic6 and angular 14.
My code css working fine in simulator in Android studio.
While creating sample build then css not working in real device can you please help me.

Please suggest me what should i implement to work my css properly in real device as well.

Note: I am using bootstrap using npm.