There is a error on calculation?

I think there should be an bug on the calculation on eazyBI. AS shown in the table, column Executed is the sum of TODO and BLOCKED. However, on the first and last column it shows incorrect values.

Executed cell value on first row should have been 68 = 64 + 4 instead of 67. It’s similar to the executed cell value on last row.

Any comments on this issue