Q.String of Pearls
Is it normal for my string of pearl plant to be sticky?

The sticky substance is likely caused by an infestation.
Treat your plant with Neem Oil.
Neem Oil is safe for people and pets!
Here is some links with more information.
https://www.gardeningknowhow.com/garden-how-to/info/what-is-honeydew.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/string-of-pearls/string-of-pearls-plant.htm