I believe that you've installed a brand new Confluence instead of upgrading your current instance. Please check here all the isntruction regarding Confluence upgrade and double check if there's any step that you might have skipped:
Hope it helps!
If we are sure Confluence was actually upgraded it could also be that our index is corrupt. In which case, we would want to rebuild it to be sure. There is also the possiblity that legacy customization is interfering with spaces being displayed. Instructions for checking on these potentials probelms can be found at the following page.
I hope this helps (assuming it is the case that Confluence was actually upgraded of course).
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