The finish date in the Idea object has been updated to have a Default Date of Rolling Date = End of current year.
When you start an idea, the idea grid will show you the Dec 31,2020 date, but once all required fields are completed and the idea is saved, the finish date will change to the current date.
This is a known Defect#DE54918
Release : 15.7.1
Component : CA PPM SAAS APPLICATION
Resolved in 15.8.1