4.2.1 folder bugs

I just installed iOS as new rather than backup on my iphone 4. I checked the "find my iphone" features but it did not give me the exact but nearby location. I was organizing my apps and I found folder bug on my few minutes with this iOS 4.2.1.

1) The apple official calendar date does not update on the small icon/app folder (iphone 3gs 4.0.2 non-jb)

2) At wiggle state (4.2.1),
- I pressed on the folder and it does not show my apps inside the folder.
- One app on a folder - previous version (4.0.2) the folder disappear and the last app will be on the page.

I want to see if this know issue or just my iphone 4 .. i will do more intensive testing later.