This can happen by accidentally over-filling your reservoir past the "MAX" fill line, or drips coming off the thermometer when opening the lid. In small quantities, this should be OK and there is nothing to worry about.
With your LEVO cooled down and the reservoir completely drained of liquid, remove the reservoir from the unit. Any excess liquid/ residue still on the heat plate or in the heating chamber can be wiped away and cleaned off with a damp cloth. Use a cotton swab to clean inside the drain hole.
Never pour any liquid inside the heating chamber to "rinse" it without the reservoir and nozzle installed securely in place! Otherwise, the liquid will leak through the drain valve and reach the electronics inside of the LEVO. Instead, wipe away any liquid/residue using a damp paper towel or cloth.
Otherwise, liquid will get between the pinch valve/gap in the drain and collect inside of the unit.
If a large amount of liquid spilled and started to leak out of anywhere but the drain funnel, check out LEVO I: Leaking from back panel or base.