I don't wanna be the one what swings the opposite way, but, ifin yer followin the stackin rule fer smokin which is, beef on top, pork in the middle an poultry on the bottom, yall violated the rule. Now this ain't a set in stone rule, there are exceptions, but, just a good idea not ta vary from the rules cause it can get ta be a habit.
The idear is, the beef is the least likely fer contamination, followed by pork an bringin up the rear, er the one with more potential fer causin contamination be poultry.
One of the exceptions ta the rule would be ifin they are both put in at the same time an cooked ta the proper temps. I just don't like food posionin so I don't play with the rules to much. If ya ever got a good case a food posionin ya would never wan't another.
Just better ta be safe then sorry is all. Just my two coppers worth.