Wheeze worts which body don't cool down

I don't really know what happens to the wheeze worts I've planted here :

It's been "days" since these 3 wheeze worts have been planted, yet there body temperature do not cool down.

The one in the middle have a body temperature of 19°C.

And the surrounding carbon dioxide is around -40°C

I was just testing if I can liquify some carbon dioxide to unlock it in the ressources list, without making a room just for this purpose.  

Vesta.sav