There is one percentage of DiffieHellman key agreement test failed

This is a deep-hiding bug. There are 12 tests in my testing program, If I run 36 round of my testing program. I got 5 test failed. The following is the failed tests:
   =========Round 6========
STATUS:Failed. 1 Failed: Algorithm -- diffieHELLMAN NumberofParties -- 4
   =========Round 7========
STATUS:Failed. 2 Failed: Algorithm -- DiffieHellman NumberofParties -- 3 Algorithm -- diffieHELLMAN NumberofParties -- 4
   =========Round 21========
STATUS:Failed. 1 Failed: Algorithm -- DH NumberofParties -- 4
   =========Round 28========
STATUS:Failed. 1 Failed: Algorithm -- DiffieHellman NumberofParties -- 3

all other test passed.