In order to solved this temporarily we need to select the timesheet (Current) and refresh the page, it is a rendering issue.
Release : 15.7.1
Component : CA PPM TIME MANAGEMENT
Carousel has received some improvements in past releases. Essential Clarity Add-Ins (System: PPM content, Accelerator: Program Management Office) had items that were not fully upgraded after Clarity upgrade, so the Modern UX had some items that were not up to date.
Go to Administration > Studio > Content Add-Ins and verify that at least these two add-ins are showing up as 'Installed' (verify the Post-Upgrade Steps documentation in the Additional Information section on how to apply any items that are not fully upgraded).
(On-Premise and SaaS) Complete the Post-Upgrade Steps > Post-Upgrade: Final Steps to Complete Your Upgrade