which ones Marco? the ones wavy davy posted? the fleece inside holds the fuel, there should be no liquid as such. id be guessing theres too much in if its coming out. ive filled mine twice the reccomended dose and i can turn it upside down without the burner and nowt comes out at all.
on the plus side if it does leak ive got the added bonus of getting warm VERY quickly whilst doing my best dog impression.......woooof!