The execution order of email rules is important. In general, you would have some basic rules that apply to all incoming emails to be executed first, then more complex rules that do specialised tasks, eg. create a job.
Generally, after running a specific complex rule, you would stop the execution of any further rules by ticking Stop other rules if this rule is run.
Click Finish.
You can change the execution order of email rules by selecting the rule, then clicking the Up/Down buttons to the right of the rules on the Email Rules screen.
Further information: