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After the plants get to a certain size, the tops die anyway (or fall over), which is why they make so many plantlets, and so they are constantly regenerating. Better to start new plants than to try to save an old spindly plant. The new young plants will be stronger. You probably could root the top, if you cut it off, but I would rather nurture a new younger plant.

https://www.gardeningknowhow.com/houseplants/kalanchoe/kalanchoe-chandelier-plants.htm

You can split the offshoot off. This will be no problem. It looks like the flowering stalk will mark how tall the plant has the potential to reach. You may cut these back pretty hard after they are done flowering. This will cause them to spread. Since the plant is not too large yet, you can split them and put each in a one gallon container until you start to notice a large amount of roots coming out of the bottom of the pot.

This is a type of Kolonchoe.
Here is more information.

https://www.gardeningknowhow.com/houseplants/kalanchoe/growing-mother-of-thousands.htm

The images don't show anything that I can say looks wrong. Soil should be moist but never soggy. You can let the soil dry out before watering again.
https://www.gardeningknowhow.com/houseplants/kalanchoe/growing-kalanchoe-plants.htm

Make sure the soil is not soggy, over watered and that the pot is able to drain any excess water. Let the soil dry out before watering again.
If the leafs are soft, floppy and mushy they may have suffered cold or heat damage.
You can remove any damaged leaves.
Flowers will open as the plant matures and the amount of light or temperatures of the room can effect how quickly the flowers open.
https://www.gardeningknowhow.com/houseplants/kalanchoe/make-a-kalanchoe-rebloom.htm

This does not appear to be a flowering spike. Just a deformed leaf. This can happen on occasion. Flowers will come from the direct center of each spire, and usually as a cluster of knobs. It will quickly elongate before flowering.