I would drive around the area both day and night, and see if there are any red flags that stand out to you.
All an agent thats in the direct area and see what they can tell you about the homes, and the builder if its a track project, take a look inside of them then decide. IT could also mean taxes have gone up and they can't afford the house with the new tax, or could it be in a new flood zone? Most times it means nothing, yet if it concerns you do your home work as the agent can only tell you so much and the rest is up to you to find out....
Hope this helps and congrats on being a new home buyer!