Leave the pump running for a couple of minutes when you're not attached & condensation will disappear. If it's actually milk in there, take everything apart & re-put it back together. I had the Symphony, think they're quite similar. Also, if the diaphragms aren't on properly it draws milk up sometimes & likewise if you're letting the bottles over-fill.
Hope that helps! If not, give Medela a call- they're really helpful & efficient![]()