My 377 has a similar gap, about an inch out in the center, flush on the ends.
It has not been a problem. the seals are still keeping water and air out, probably not worth worrying about unless you identify a leak. Maybe if your rv is ever in a good shop for some reason they can look at it, otherwise I would not be too concerned. As mentioned earlier, the main retract cables are at the ends of the slide so that area gets more pressure when retracting.
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