Recently my CCleaner has changed the startup screen.
I had set CCleaner to open to the Custom Clean screen, but lately it has been opening up to a "Welcome back to CCleaner" screen.
Executable file removed-Nukecad.
It is not a bug, it is a trial of a new User Interface.
What you are seeing is a Beta trial of that Welcome page.
Only some users are seeing it and not everybody.
That's what Beta trials are about - to evaluate/check something in the real world by giving it to a limited group of users first before a full roll-out.
It may well be changed before it is fully released to everybody.
See this: https://community.ccleaner.com/topic/64278-welcome-back-to-ccleaner-professional/page/2/#c