ADSP21489 filter response different at different framework sample rate


I'm writing a new project using Sharc ADS21489 running at 48KHz

I re-use for this project a 15KHz filter that I have used in a previous similar project but who worked at 192KHz.

I notice, in SigmaStudio simulation but also running on machine, that the frequency response for the same filter change if the framwork runs at 48KHz or 192KHz

I's possible?

This is the simulation of the filter @192Khz core running

And this is the same filter @48Khz core running

I use a cascade of 2nd order extended precision floating point Type2 filter for it.

Can someone explain me this difference and how to prevent it?

Thanks in adavance