Unreadable dashboard after login

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I'm having a weird issue with the dashboard. When first logging in, the dashboard shows normally. Going to any section within the dashboard, or reloading the dashboard, results in a scrambled dashboard layout.

This is obviously a CSS issue. When I view source on the normal dashboard and the scrambled dashboard, I've discovered that the following CSS has been added to the head:

<style>img.ccm-captcha-image{display:block}*.ccm-spacer{clear:both;font-size:1px;line-height:1px}div.ccm-pagination{text-align:center;position:relative}div.ccm-pagination span.ccm-page-right{position:absolute;top:0px;right:0px;margin-right:0px!important}div.ccm-pagination span.ccm-page-right span{margin-right:0px}div.ccm-pagination span.ccm-page-left{position:absolute;top:0px;left:0px}div.ccm-pagination span{margin-right:4px}.ccm-ui div.ccm-pagination span{margin-right:0px}div.pagination ul strong,div.pagination ul span.ltgray{display:block;padding:0 14px;float:left;line-height:34px;border-right:1px solid #ddd;text-decoration:none}.ccm-layout-table .ccm-layout-col{float:left}.ccm-layout .first .ccm-layout-col-spacing{margin-left:0px!important}.ccm-layout .last .ccm-layout-col-spacing{margin-right:0px!important}.ccm-error{font-weight:bold;color:red}.ccm-required{font-weight:bold;color:#3975ad}div#ccm-overlay{position:fixed;z-index:99;top:0px;left:0px;background-color:#000;filter:alpha(opacity=70);-moz-opacity:0.7;opacity:0.7;height:100%;width:100%;display:none}.ccm-input-time-wrapper select{width:55px!important;margin-right:4px!important}.ccm-input-date{width:80px!important;margin-right:4px!important}</style>

I can't figure out why the additional CSS is being added or how. I've completely reinstalled Concrete5.6.1.2 following Adam Johnson's instructions (here:http://adamjohnsondesign.com/blog/upgrade-concrete5-with-minimal-do... but it didn't resolve the issue.

Any ideas?