2
From what you have given it looks okay to me. You have the "default" admin theme showing.
Click on:
System Overview «
And the menu will expand.
You can select the "admin theme" in "Preferences>General Settings". You have four options..... "default", "exm", "thadmin" and "legacy". "legacy" is the old 2.0.x admin theme.
Hope this helps.
I see you're using 2.3.0? There's an upgrade package to 2.3.1 - this contains some important bug fixes, including some for the "thadmin", "pm" and "profile" modules shipped with the core. The upgrade package isn't too big at all and I would recommend upgrading at the earliest opportunity.