css & rendering difference on windows vs linux

We are developing application using GWT2.1 and application will be
deployed on Weblogic 10.3 server.
One of our screen uses DiscloserPanel. Content section has one
Horizontal panel which in turn has 3 flow panels that has borders.
When i run application in dev mode i see expected results. Then i gwt
compiled application and deployed war file to my local Weblogic
instance on windows, I get same results (as expected). But when i
deploy same war file to Linux weblogic server, I see some differences
in rendering (css differences). Flow panel borders should be collapsed
but ther has some spacing etc.. In all instances I am accessing
application from same browser.

What could there be css/rendering differences when same war file is
deployed on 2 diff OS .?
Any help would be greatly appriciated.

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