I have some ayupans And I have a lot of problems with those:
and also th elittle ayupan from CDL 07-08 (it's so small and came with a pot)
The others I have stand correctly... but with thos I have to put them with sth behind or... Like I did for those fotos I bend a bit the legs so that the legs can hold the weight and the feets are straight ^^ Then they will stand.. but the minimal move around and they'll fall... XDDD