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The simplest way to have more plants is to divide hosta. Growing a hybrid from seed is often disappointing as you don't always end up with the same characteristics of the primary plant. Plant breeders mix characteristics from different hostas to make a hybrid. So several sets of genes are at work; parts of each set get passed on to the seed so what you grow is different from the primary plant. Here is a "how-to" for growing hosta from seed: https://ask.extension.org/questions/383783

It looks like I see feed pellets from a slow release fertilizer in the container. If compost was added with this, then the nutrient content of the soil is so high that it is burning the plant.

These are not heavy feeders and will do fine in low nutrient soil. I would recommend replanting into some fresh soil, either without nutrients, and mixed with compost, or with nutrients and not mixing with compost. Both together are a bit much.

This article will help you to replant this and care for it after: https://www.gardeningknowhow.com/ornamental/foliage/hosta/hostas-containers.htm

I prefer to cut down the flower stems once the flowers have faded.
Then allow the foliage to die down naturally.

https://www.gardeningknowhow.com/ornamental/foliage/hosta/hosta-plant-flowering.htm
https://www.gardeningknowhow.com/ornamental/foliage/hosta/cutting-back-hosta-plants.htm

The holes are likely from Slugs. They are difficult to see, as they are out at night.

https://www.gardeningknowhow.com/ornamental/foliage/hosta/hosta-pest-control.htm

Bloom time can certainly be effected by weather and if the plants are affected by pests or in your case the slugs. Your plants will bloom when they are ready.

The keys to keep hosta going are to grow in shade and to keep the soil moist. Some morning or dappled sun is OK. I hope you have 3-4 inches of mulch to help keep the soil from drying out. After routine watering, dig a small hole with a trowel and see how far done the soil is moist. The roots are deeper than the top 2 inches so make sure soil is moist at root level - up to 8 inches down.

Go out at night with a flashlight and look for slugs. These creatures love hosta, especially the thin leaf varieties. Here are some control measures: https://www.gardeningknowhow.com/plant-problems/pests/insects/kill-garden-slugs.htm
Be careful if you look in the stores for bait as some are toxic to birds and other small creatures/pets that might eat them. Sluggo is one brand that is not toxic to birds, etc and is approved for organic gardens.