MEGAN: Contribution of different vegetation types to BVOCs

Dear all,
I simulated a certain vegetation type, such as deciduous trees, using MEGAN, and found that the emitted BVOCs exceeded the total BVOCs emissions of all vegetation types. What could be the reason for this? I modified the growthform.csv file in the EFP input, allowing one vegetation type to participate in the normal calculation while setting the coverage of the other three vegetation types to 0 for simulation. Is this approach feasible, or do I need to modify other parameters? Please advise. Thank you!