I'd say your next move should be to start backstocking. 😉
In all seriousness though, I'd say some coachings are in order here. I'd start with the Team Lead supervising the backroom team while you were gone. If your team can do well with you there, but not while you're gone, that's a sign that you are a good leader, but maybe the TLs under you aren't.
Don't jump to that conclusion too quickly.
Like pp said, maybe there were issues - callouts, double trucks, HUGE price change workloads, LOD's pulled people to help in other areas, PDAs went down, larger trucks than normal, or issues with the products on the trucks (ie crap ton of UP and UP diapers coming in, but not on PIPO pallets.)