It could be that the cleaning fluid inside the SmartClean cartridge has leaked in the device.
This can happen if the device is tilted while trying to plug in the charger.
Please make sure you take out the cartridge before tilting the SmartClean station.
To solve this issue you can take out the SmartClean catridge, wipe the area dry with a clean, soft cloth. Put the catridge back in the system again. Your SmartClean system should now be working fine.
If your SmartClean still continues to overflow then please contact us for further help.