I was thinking this, too. It could be that they're just overfilling* less than they used to. See if the volume in your bottles is at least what the label states. If it's not, then you have a legitimate complaint. I hope it works out for you!
*I work for a company that manufactures scientific reagents and we fill each vial/bottle/etc with a little extra over the stated volume to ensure that the customer gets at least the stated amount. There can be a lot of variation in machine filling, so we try to compensate for that.