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If it bothers you, replace it. Probably going to be a dealer do it as you don't seem to know how to fix it yourself.
I have a 2010 and this seems to be a problem with the thin plastic on the start/stop button The center of mine completely detached and fell into the hollow. From what I've researched, there is no part replacement other then replacing the console for around $750 not counting labor. A cheaper $3.00 fix is to order this cabinet knob and place it in the hollow plastic button. Works great for me and looks like it belongs there. Liberty PN0058C-SN-C 7/8-Inch Diameter Cabinet Hardware Knob 25mm Height
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