Compost differences

Was there a temperture change Mark as we have had some cold nights lately? Just wondering?

It was definitely caused by the compost. They are all in a propagator and there were other plants in there also, mainly chillies which are fine. I left some 'seconds' on the bench in the shed bare rooted and they are looking in a lot better condition than the potted up plants. I've just potted up a couple of those today, mainly capsicums and one aubergine and tomato.