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There are a couple of possibilities for your blue morning glories coming up with purple blooms. One is that the wrong seeds have been accidentally placed in the packet by the seed provider. The second is that your morning glory plant has been cross pollinated by another type of morning glory growing nearby. It is recommended that "Heavenly Blue" morning glory seeds are purchased new each year, as seeds the plant produces tend to revert back to the purple color. Keep trying and good luck!

Here are a couple of articles you might find helpful:

https://www.gardeningknowhow.com/ornamental/vines/morning-glory/morning-glory-varieties.htm

https://www.gardeningknowhow.com/ornamental/vines/morning-glory/morning-glory-diseases.htm

It's difficult to say with this description.
This article has information on some issues known to Morning Glory Vines.
https://www.gardeningknowhow.com/ornamental/vines/morning-glory/morning-glory-diseases.htm

Yellowing leaves can indicate a watering issue; too much or too little, pests or disease.
Container plants need more water, daily or even twice a day in temperatures above 85 degrees F.
If the plant is root bound, it may not be taking up enough moisture or nutrients.
This article will refresh you on the care requirements.
https://www.gardeningknowhow.com/ornamental/vines/morning-glory/morning-glory-in-pots.htm

I'd love to see a picture because blooms aren't usually a problem. If you over-fertilize with nitrogen, you'll get a lot of leafy growth but not many flowers. Morning glory goes very well without additional fertilizer; it is actually considered invasive in some US areas. Also, if it isn't in full sun, bloom will be weaker.

This article will help you.

https://www.gardeningknowhow.com/ornamental/vines/morning-glory/morning-glory-not-blooming.htm

It's true that most perennial and bulb plants will do better if the foliage is allowed to die naturally before cutting.This allows the plants to draw nutrients from the leaves as long as the leaves are still green. If the leaves turn brown and appear dead, then you can cut them back and cover with straw, even if there hasn't been a freeze yet.