i don't have a fuzion but lots of step problems over the years.
'it seems'? you need to get someone looking when you are stepping on the stairs. the steps may just be bolted to the frame and the bolt needs to be tightened.
or the steps may have a broken piece on it, carefully compare both sides of the steps, one of the stops could have broken off. There was a recall on a certain step a few years ago...
and some steps are just cheap, you may want to upgrade?
and finally, if your trailer is under a warranty get to the dealer.
good luck
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