PB and primary drip at the same time

[Nefarias Bredd]

Hey, came across this last night and trying to figure out why it happened. 
 

So I had 2 infusions to hang, by gravity. Set up the primary, had it hanging low off the stretcher pole. Set up the piggyback, and it’s way high from the ceiling hook. 

 

But then when I hooked everything up to the patient both were dripping at the same time. 
 

The only thing that I could think of in the moment is that using two primary tubings instead of the short piggyback might have affected something, but then again I’m pretty sure I’ve done it this way and it worked fine before ?

[JBMmom, MSN, NP]

If you hung both on primary tubing that wouldn't really be considered a piggyback, would it? Unless you still hooked the secondary up to the higher administration port? When we low port on the pumps, both infusions run concurrently, so my impression is that you had the same set up, just with gravity and not an infusion pump. Or if the secondary bag was a large volume, maybe you didn't have the primary bag low enough?