These are two different css path from firebug.

Production:
html.js body.html div#page.page section#section-content.section div#zone-postscript-wrapper.zone-wrapper div#zone-postscript.zone div#region-postscript-second.grid-4 div.region-inner section#block-views-event-block-upcoming-block.block div.block-inner div.content div.view div.view-content div.views-row div.views-field div.field-content div.grid-4 div.grid-1 span.date-display-single div.m

Local:
html.js body.html div#page.page div#section-content.section div#zone-postscript-wrapper.zone-wrapper div#zone-postscript.zone div#region-postscript-second.grid-4 div.region-inner div#block-views-event-block-upcoming-block.block div.block-inner div.content div.view div.view-content div.views-row div.views-field div.field-content div.grid-4 div.grid-1 span.date-display-single div.m

Why are production and local server render the html differently?

Any idea?