Hello. I'm sorry to hear about your cat.
This is very strange. It's not anything that is typical when coming out of anesthesia. I would actually wonder if there's something going on with the brain and the anesthetic event was the tipping point to cause a seizure to surface.
The best thing to evaluate the brain, is an MRI. MRI is, as in people, the gold standard for brain imaging.
I think the other odd signs you're seeing can definitely be related to the underlying cause of the seizure. Most of these signs (incoordination, weakness) can be seen after a seizure, but they typically go away within hours. If they are persistent, then I would worry about a brain tumor or stroke or bleed in the brain that is leading to continued weakness.
I wish I had a better way to justify the signs, but unfortunately I would have brain tumor or stroke as the most likely cause of what you're seeing. If you can get an MRI, I would go that route to know for sure.
I hope this helps, let me know if you have any other questions.