Ultimate TinyMCE adds extra toolbar buttons to your post content editor. On your screenshot, these extra buttons are extending over into the right sidebar column. If you want to continue to run Ultimate TinyMCE and have these extra toolbar buttons, you have two options:
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At the top of the Edit Post screen, go to Screen Options and choose a 1 Column layout. That will remove the sidebar and move the “Featured Video,” “Publish,” “Category,” and any other boxes from the sidebar to a new location below the content editor box.
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You can move the extra toolbar buttons to a new row, so that the editor does not get too wide. To do this, go to the Ultimate TinyMCE admin menu. You’ll see a list of toolbar buttons. The ones with a check mark in the “Enable” column are the ones you are currently using. For each toolbar button, you can choose which row the button will be located on. Change each of them to “Row 3” or “Row 4” and click the “Update Button Options” button at the bottom of the page.