I am trying to create a water surface with waves using the Three.js ocean shader example. code example

However, when I run the same code from this example, my result looks completely different.

The expected result should look like this (with waves):

example waves

But my implementation looks like this (no waves):

mine waves

I copied the exact code from the example, but the waves are not appearing.

What could be the reason for this? Could it be related to my WebGL version, GPU, or browser settings?