Where's the rest of my reward

[spixel]

Hi, I'm new to bitcoin. Noticed I seem to be missing a certain percent of my rewards unless I'm doing the math wrong? Slush's pool

4:17:18    
total share 32410508
my share 623    
BTC Reward 0.00036382

0:52:34    
total share 6947443    
my share 142    
BTC reward 0.00037057