you're going to need to provide some dditional input
lets start with this
is this a harmonic analysis?
what is the workflow that you're following
can you post some pictures of what you're talkinga bout
and describe your setup
the reason i say this is that if you're doing a time history analysis, the output is the results over time, as a combination of th eresponse from all frequencies. if you want the max, use an envelope plot.
if you're doing harmonic analysis, the output is the max at each frequency baesd on the combination of all the frequencies response.
it sounds like things are workign as expected but that you may not be tuned into how linear dynamic works. the help and training cover it well if you need a refresher