@eckstein
== or sometimes overlapping ==
That is a design issue that was not caused by BuddyPress.
== the side bar on my BP created pages is pushed down ==
Not sure how extensive your modifications were. But if you did not make major HTML restructuring, check out how we made a simple Twenty Eleven child theme compatible with BuddyPress here https://codex.buddypress.org/theme-development/theme-dev-bp-template-pack-walkthrough-twenty-eleven-bp-1-5/