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Further inspection of the plants may be necessary to diagnose the issue.
These articles may help you.

https://www.gardeningknowhow.com/edible/vegetables/peas/pea-plant-diseases-and-pests.htm
https://www.extension.umn.edu/garden/yard-garden/vegetables/pea-diseases/

I would also suggest taking a sample to your County Extension Service.
https://www.gardeningknowhow.com/extension-search/

Garlic, rosemary oil, and lavender oil are good methods for killing Mildew in the garden. This article will help as well:https://www.gardeningknowhow.com/edible/vegetables/peas/pea-plant-diseases-and-pests.htm

Peas are legumes, which means that they will gather their own nitrogen, and require only slight fertilization for phosphorus and potassium. This sounds like nitrogen toxicity. There is probably too much fertilizer in the soil. Here is an article with more information on growing snow peas: https://www.gardeningknowhow.com/edible/vegetables/peas/how-grow-snow-peas.htm

There are several options here. The fastest method will be hydroponics. This can be tricky to get right if you have never grown hydroponically, though. The next thing that I would recommend is a good, rich organic potting soil enriched with worm castings and a little compost. This will give you the fastest results, while not requiring much input on your side of things.

This article will help you in growing snow peas: https://www.gardeningknowhow.com/edible/vegetables/peas/how-grow-snow-peas.htm

They may all have aster yellows. In which case you would need to destroy the plants as there is no cure. For a definitive diagnoses you may want to consult a plant pathologist at a local university in Australia.

https://www.gardeningknowhow.com/plant-problems/disease/aster-yellows-disease.htm
https://www.gardeningknowhow.com/ornamental/flowers/calendula/common-calendula-problems.htm

This happens in beans and peas, both, for the same reasons. With beans, it can be due to the particular cultivar. With Peas, this is less likely. With both specimens, improper watering will be to blame. Letting them get too dry, then watering too much will be the primary cause.

However, disease and pests can cause this, as well. Unfortunately, your images did not come through, so I am unable to diagnose the issue further.

Unfortunately, our only article on the subject refers to beans, but since this happens to beans and peas the article will still apply to you. This will help:

https://www.gardeningknowhow.com/edible/vegetables/beans/bean-pods-curl-while-growing.htm