Increasing the Listing's Rental Price after rental

I've noticed a new trend, it's happening pretty regularly these days... I've seen several apartment rental listings change their price up after marking it as "rented" or no longer available. For example, a listing may have started at $3500 or more a few months back, and down to $3000 or lower these days. Eventually it gets or shows as "rented" and the price suddenly goes up $500 or more back their original pre-2020 levels. Is this to keep other renters from being aware of what the going rentals levels are, or does this affect the overall reported numbers and statistics that others later analyze?