Code used in cPanel does not respond the same as through my localhost

I have an account with Bluehost which uses an Apache server. The code I am using works just fine on localhost, but when I transfer the exact code to the Bluehost account it responds slightly differently (responsive break points and grids, specifically) through their server. I am a bit inexperienced, so there might be some obvious stuff I'm missing. But I'm just confused at how I can use the exact code on the localhost and on the Apache server and get slightly different results. Can anyone enlighten me?