Issue with Bonmin results

[AhmedShamy95]

Hello, 

I am using CasADi on Matlab for solving MILP optimization problem with BONMIN solver that is interfaced within CasAdi. The issue is I have some variable that when I reduce its maximum limit, I get better results. I think this is not normal. My guess is maybe the solver stops after certain number of trials? 

let me know if you have insights on this issue and what I can do?

Thanks