Well your shares are looking off. It seems like you had a problem at the end of a block 18152 and start of a block 18153. For 18152 you should have about 6360 shares and for 18153 you should have 4770. So it is clear what happened. You stop mining or you had connection problems. You do know how scoring system works right? If not look back it is explained(last time) from page 429 on. If you have additional questions let me know.

EDIT: End of page 429
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And because of my lack of cognitive processing it took about 5 pages to get me to understand. So if you cant get it from that please ask more questions. Basically take the phase of the mood at 3pm then put in a constant for the size of your best friend's cat. divide that by the number of people in your home town during the year of your mothers birth. now multiply that all by your hash rate, divide by the total number of points and then multiply that by the total reward minus 2%. It really is that simple. 

Before anyone yells at me it's a joke and I'm picking on myself.