Exp Rate Bug? | Exp is lower then it should be |

I've been noticing that when I am getting exp, it is about 400 exp lower then it should be.

Example:
Before Bug: I hit a 6, I get 6000 exp exact.

Right now with Bug: I hit a 6, I'm getting 5,600 exp?

This is happening with everything.
I am trying to get 99 mining.
First, Addy Ore is 950 exp.
Then today, it is 475 exp.

If you could, look into what the problem is and fix it.
Thanks.

I think it is supposed to be 750 or 950 exp a hit not 1000

Lowered some XP rates before I left for holiday thats why