Henna cones do this sometime but is nothing big. Typically this happens if the cone has been warm for a little while.
The best thing to do is to squeeze the first little bit from the tube before application. This liquid will stain but since is is liquid it will spread and not be precise like the paste.
Our suggestion is to wipe the liquid off before it sits on you skin too long. Just a short few minutes won’t stain too much and won’t remain for long.
I will try and find a picture of this and post later.