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Tab Pane drives next section downward - except on all other devices

If in DESKTOP mode you click on the “3 Case Studies” TAB - the tab pane appears and drives the sections below downward. This is good. Just what I want it to do.

If, however, you attempt this same action in any other of the other modes (tablet, mobile-landscape or portrait) the emerging tab pane overlaps the next section. Help! Any idea why this is occurring?

Here is the project link.