Try this: https://fxdreema.com/shared/tprHFn18e
Look at the first two settings in "Draw Fibonacci" - they tell the block how to manage objects. The same block can create multiple objects and because each object has unique name, if the block is set up to create multiple fibonacci objects, each of them has different name - fibo1, fibo2, fibo3... Basically "fibo" is only the base name, which is then appended with a number. But in my version I selected those options in a way to create only one fibonacci with name "fibo" and then update it.

Yes, this strategy is often requested and I shared some example that I made long time ago, but it's just a stupid strategy with wrong inputs.