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Your lily may have mutated. Random mutations happen during cell division and replication, after exposure to radiation or because of weather extremes. Or it could have reverted to one of its parent's characteristics. If you don't like the white, you can prune it out.

https://www.gardeningknowhow.com/garden-how-to/info/what-is-plant-mutation.htm

https://www.canr.msu.edu/news/mutation-examples-and-how-they-happen

You can't divide the main bulb. There may be some young bulbils around the main bulb but it doesn't sound like there are any mature bulbs or they would have sent up stems.

I would wait another year at least and see if you get more stems.
https://www.gardeningknowhow.com/ornamental/bulbs/lily/dividing-tree-lily-bulbs.htm

This isn't typical and indicates a problem with the area. Whether this be too moist or too dry, or there are pests eating the roots, there is an issue that needs to be corrected. I notice that some of the plants' leaves droop and some are more erect. This indicates that some of them are starting to fail due to conditions of the soil. The rest might follow.

Check for moisture levels. Too much moisture will suffocate the roots, but being too dry will cause the roots to fail to take in water and nutrients.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-percolation-in-soil.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

As for staking- For now if you want to keep the visual appeal, try taking smaller stakes and only tying to the areas where the stems are bending to straighten out the section.

Here is an article that will help you to care for the plants:

https://www.gardeningknowhow.com/ornamental/bulbs/lily/growing-tree-lily-bulbs.htm