Skill and fast-forward time glitches

I didn't have this problem till a few days ago.
Basically, i have two issues. First is my skill percentage goes above 100 for a while before leveling up.
Second one is that fast-forwarding time sometimes doesn't function well. Like the time says 5.50 pm but then it jumps back to 5.10 pm. 
I thought the new CCs i downloaded caused this so i deleted all the CC i had. I only downloaded MCCC as a mod and after looking at what it does, i deleted it. But the issue still is there. What can i do?