PROBLEM: You published your Unbounce page and there is white space under your footer.
SOLUTION #1: Make sure nothing is overlapping two layers.
SOLUTION #2: Turn off Google Analytics and see if that fixes it. If so, then you have found your problem. Make sure Analytics is marked Before Body End tag and not marked Head tag.
WHY: While Unbounce offers some great features, it also does things which have me banging my head on the desk. However, their support group is quick and ready to help. Don't be afraid to chat one of them up. They might be able to fix your problem quickly.
MORE INFO ON ANALYTICS: How Do I Add Google Analytics to My Landing Page?