How decimation rate affects frequency scanning

I am running a code where the transmitter should sense a frequency
spectrum of 90MHz in 18 steps. When I fix the decimation rate at 16, the
code works fine, but when decimation rate is changed to 32, after one
complete scan of the frequency spectrum(ie 90 MHz), the transmitter
the frequency bands in a random order.So I would like to know how the
decimation rate is affecting the order in which the frequency bands are

Thanks in advance!

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