The seeds that you have purchased in the past come from a selection of totally different breeders. Any seeds that are bred indoors will be much smaller than those bred outdoors. Outdoor bred seeds tend to be much larger and plumper but the size of the seeds has no bearing on their viability.
We cannot request a certain size of seed from breeders, if the seeds are bred indoors they will be smaller, they are bred this way so that there is no risk of any contamination to the seeds.