When more than one sequence flow is attached to an activity, the transition that was dragged first will be executed before the transition dragged later. You can specify the ordering of the execution order of the transitions.
To define the sequence flow order:
In the Process Designer, right- click the gateway activity in the Graph Canvas area to which more than one sequence flow is attached and select Options
icon from context pad and then select Sequence Flow Ordering. 
On the Sequence Flow Ordering window, select the required activity and move it using Up (
) and Down (
- Click Done to return to the Graph Canvascanvas area.