ECMWF open data website list 13 pressure levels for High-resolution products, but why ftp only contains 9 levels for u,v,r,t ?

[weatherforecasterwhai]

On the website: https://www.ecmwf.int/en/forecasts/datasets/open-data, it says:

High-resolution products:

Single and Pressure Levels (hPa): 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 50

But, on the ftp, both these two sites:

https://data.ecmwf.int/forecasts/20240301/12z/ifs/0p4-beta/oper/

https://data.ecmwf.int/forecasts/20240301/12z/ifs/0p25/oper/

I can only get 9 pressure levels for u,v,r,t variables.

Would you please explain why?

Thank you!