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The container looks like a pot within a pot, so it could be a drainage problem. When you water, do you remove the inner pot to water and let it drain before returning it to the cachepot? If not, there could be water collecting in the bottom that is being absorbed by the roots.

If you think it is root rot, replant in fresh cactus soil.

https://www.gardeningknowhow.com/houseplants/snake-plant/droopy-snake-plant-leaves.htm

https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm

Sansevieria trifasciata ‘Black Gold’ and Sansevieria trifasciata ‘Cylindrica’ are two different varieties of snake plant. I can find no reference that they come from the same rhizome. If you have both coming from the same rhizome then it is an anomaly in genealogy.

This article will help you understand why your snake plant is leaning:
https://www.gardeningknowhow.com/houseplants/snake-plant/droopy-snake-plant-leaves.htm

Although these plants can go without water more than most, they do like a regular schedule, so make sure you are watering them at regular intervals. You can snip the brown tips off, leaving just a bit of brown on the leaf.

Thank you for the kind words and so glad we could help! Keep reading!

It could be honeydew produced by scale or aphid insects. Here is more:

https://www.gardeningknowhow.com/houseplants/hpgen/sticky-plant-leaves.htm

Unfortunately, your photos did not come through. I am unable to assess the situation.

It is perfectly normal for leaves to grow vertically, or straight up and down. They can grow horizontally, or sideways, as well! It just depends on the species.

This collection of articles will help you with the care of the plant:

https://www.gardeningknowhow.com/houseplants/snake-plant