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Ha-ha. Too funny. Looking through all the toxic lists (there are at least a dozen of them) I don't see waffle plants on any of them. In the future, if you have occasion to look at any of these lists, use the ones that show the relative toxicity. I've had plants all my live, and cats too, and the cats have chomped many of the so called "toxic" plants with no more ill effect than a barf puddle on the floor. My experience is also that the ones that are listed as "non-toxic" are the ones the cats will eat down to the stems, so those are all outside my home, and only the "toxic" ones are inside with the cats. But that's just me. Your cat might find the waffle plant tasty, however, so you might want to keep it out of reach. Or grow it in a terrarium, which is really the only place they do well, because of their need for humidity. These articles will tell you more: https://www.gardeningknowhow.com/houseplants/waffle-plant/waffle-plant-info.htm
https://www.gardeningknowhow.com/plant-problems/environmental/plants-toxic-to-cats.htm

It may need more water. This plant needs plenty of water and indirect light. It also does not tolerate cold very well and if it was exposed to cold, say when you brought it home, it may have damaged the leaves.

Waffle plant.

Here is a link to it's care.

https://www.gardeningknowhow.com/houseplants/waffle-plant/waffle-plant-info.htm

Inspect the underside of the leaves for aphids, whiteflies, caterpillars, or scale. If you don't see any, it could be night marauders like slugs. Usually you can see their telltale shiny trails on the cement or patio.
Neem oil is fine to spray for insects. You might try insecticidal soap. For slugs it helps to make their path rough going. Use Bt if you find caterpillars.

https://www.gardeningknowhow.com/plant-problems/pests/insects/holes-in-plant-leaves.htm

My research only showed propagating them from stem cuttings, but it's worth a try, especially since you already have roots.

https://www.gardeningknowhow.com/houseplants/hpgen/propagating-your-houseplants-with-leaf-cuttings.htm

https://www.gardeningknowhow.com/houseplants/waffle-plant/waffle-plant-info.htm

It could be fungal spots or lack of humidity or enough water. Waffle plants need high humidity and a moist, but not wet soil. This article should help:

https://www.gardeningknowhow.com/houseplants/waffle-plant/waffle-plant-info.htm

https://www.gardeningknowhow.com/plant-problems/disease/plant-leaf-spots.htm