Hello and thank you for your inquiry.
This is a fairly common occurance after cleaning a protein skimmer. After a cleaning you have removed most of the organic slime that has built up within the skimmer so the bubbles tend to travel quicker through the skimmer. As well many times the venturi and/or impeller has also become somewhat clogged and the cleaning opens these back up allowing more air to be pulled in and/or "chopped" by the impeller.
Usually within a few hours to a couple of days the skimmer will settle back down as the organic slime builds back up within the skimmer body.
If there is anything else we can do for you please let us know.
Marine Depot Customer Service