What's your question? Ask

This is not normal! It would help to know where you are located and to have pictures. These are very sensitive to cool temperatures.

This article will give you more information on these shrubs: https://www.gardeningknowhow.com/ornamental/shrubs/sweet-pea-shrubs/growing-sweet-pea-shrubs.htm

Those are good choices for your area. As for plant pests... tey carry the same risks for the same pests as most plants. I will include an article for both plants, and a link to ways to craft your own pest controls that will help you here.

SweetPea Shrub: https://www.gardeningknowhow.com/ornamental/shrubs/sweet-pea-shrubs/growing-sweet-pea-shrubs.htm
Star Jasmine: https://www.gardeningknowhow.com/ornamental/flowers/jasmine/star-jasmine-as-ground-cover.htm

Organic pest control and overall garden health: https://www.gardeningknowhow.com/special/organic/

Check for signs of pests, they may be very small. You describe symptoms of a possible infestation.
Neem Oil can be used on your plant.
https://www.gardeningknowhow.com/ornamental/shrubs/sweet-pea-shrubs/growing-sweet-pea-shrubs.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Some of them do. If you were told that they get that tall, then they are likely one of the taller cultivars. Some of them will be marked as "dwarf" or "mini" and they will be shorter.

Unfortunately, they require partial shade in the hot Summer months, and full sun when it cools off some in the Winter. With that being said, they will not do as well as they could in the spot you have described.

They will still grow and may do just fine, but they will probably not perform their best.

Here is an article that will help: https://www.gardeningknowhow.com/ornamental/shrubs/sweet-pea-shrubs/growing-sweet-pea-shrubs.htm

I notice that they are still too young to have developed tendrils for climbing, just yet. Once you notice the tendrils that protrude from the tips elongate, then it will begin to start seeking something to attach to.

These appear to be the ornamental Sweetpea, and not the edible Sweet Pea, also. Sweetpea, the ornamental, is poisonous.

Here is an article that will help:

https://www.gardeningknowhow.com/ornamental/flowers/sweet-pea/care-of-sweet-peas.htm

Starting over will be the best, and fastest way to a decent flower set.Sweet Peas do not recover well from problems, and when they do, they will be in poor health not likely flowering well.

Make sure to use a container that already contains an adequate number and size of drainage holes. Change the soil and mix potting soil with compost to avoid overfeeding. Overfeeding peas will cause lush growth, but none of the fragrant flowers.

Here is an article that will help:

https://www.gardeningknowhow.com/ornamental/flowers/sweet-pea/container-grown-sweet-peas.htm