Sand and Gravel not calculating in Lab Summary

I have a fine grained material that Sand and Gravel percentages do not calculate for our lab summary table. Interestingly enough, our sieve graphs pull from the same code and do calculate percent sand and percent gravel. 

It works if I add 99.999% passing of 0.85 mm sieve and 100% passing of 2 mm sieve. I can post the code that the calculating sand and gravel if that helps.