This cat of mine Just jumped on my back while I was cleaning the toilet.....

"Cats are climbers by nature. Don’t be surprised when your kitty suddenly jumps into your back while you’re standing in the kitchen, living room, or just about anywhere. My kitten Watson often does this to me whenever I’m preparing food in the kitchen. Still, it makes a lot of owners wonder: why does my cat jump on my back? Below, I discussed the possible reasons and what you can do about this behavior.

Jumping on your back is normal for most cats. They are natural climbers so don’t be surprised if your kitty suddenly exhibits this behavior. Knowing the cause of the behavior will make it easy for you to correct. The following are some of the most common explanations behind it.

Cats climb elevated surfaces to have a better view of their surroundings. This is an innate habit so they can see predators as they come. Also, elevated spaces are safer in the wild, especially when the cat has to sleep. Please read here why does my cat sleep on my pillow

This is the same reason why your cat will jump on your back and climb on your shoulders. The kitty wants to see what you’re doing or there’s nothing for them to climb. It’s also a sign that your cat trusts you to hold them and not drop them on the floor.

Another possible reason why your cat jumps on your back is the need for attention. Your kitty probably wants pets and food. And since jumping on your back works, the cat will keep doing it to get whatever it wants. Please read here why is my cat so mean

Take note that this behavior can become annoying over time. It’s important to address it as soon as possible so your kitty won’t develop negative behavior.

Cats, especially kittens, love jumping on the back of their owners as a playful gesture. The feline wants to play with you and they think they’ll entice you by jumping on your back. Over time, kittens will outgrow this behavior, but it’s important to correct it as some cats tend to bring it with them into adulthood.

Jumping on your back might be your cat’s way of taking ownership of you. Some cats do this whenever there are kitties around. By sitting on your shoulder, your cat can show other kitties that he’s the boss. It can be a sign that your cat is being threatened by other felines and it seeks comfort being near you.

Lastly, cats will jump on their owners’ backs because they are being very clingy. Affectionate cats are like Velcros that will never leave their owners’ side. They always want to cuddle and be with their humans physically. This is a harmless behavior, but you may want to teach your cat to be more independent, especially if you’re going to work on most days."

https://petcosset.com/why-does-my-cat-jump-on-my-back/

If you read the whole article, there are tips for stopping this behavior.