You didn't supply a link, so there's no information on what property you're referring to.
Meanwhile, there could be a lot of reasons. Let's say the home was listed right below a price break--let's say $349,900. Maybe there's concern that similar homes are really selling for $370,000 or so, and that most people search for such homes are looking in the $350,000-$400,000 range. If that's the case, a home priced at $349,000 wouldn't even come up on a search. So raising it by $10,000 now puts it in the searched range.
Another possibility: It was initially listed at a lower "teaser" price. I've seen that happen, though--honestly--I don't understand the strategy. Maybe it's in homes to spark a bidding war. But if that doesn't happen, then it's increased to a more reasonable figure.
Again, if you post a link, we may be able to better help.