I have a question about the nicely laid out graphic we all look at every day.

I'll use tomorrow as an example in Monmouth County.
If you look at the line on the chart, it says it should be just below knee high. But if you mouse over it, it says the swell will be .4 feet fall. That is barely ankle high.
Why does the chart read that it will be bigger than the swell is reported as being?

Other examples would be it says 2.5 feet but chest high, or 2.5 foot swell but ankle high.