Hi Donna- It's possible that Aberdeen left homes values unchanged, but to meet it's increased municipal budget decided to increase the ratio.
For example, if ratio is $30 per $1,000 of assessed value, then an $100,000 property, would have a $3,000 bill. So when they needed more money, they just made the ratio be higher than $30, and thereby increase the tax bill.
Aberdeen's taxes have always been a bit on the higher side, but the homes are priced lower for what you get in comparison to neighboring towns. It sounds as if you like Aberdeen & you have been looking in that town for a while since you noticed the same active listings from months back have higher taxes. I would suggest you call the tax collector in Aberdeen & ask them what is going on with the taxes. They will be happy to tell you & it is best to hear 1st hand so that you know before you buy.