I guess what you're saying is possible. I'm still not sure
if they're at the stage you mention. They are still really
small, maybe 2 to 3 millimeters across, definitely pre-flower
stage since they've just started forming. Thanks.

Steve wrote:

It's normal for the small grapes that came from flowers that didn't get
pollinated to fall off. On mine, some of the tiny grapes fall off the
cluster leaving most of them to continue on. Could this fit what you are
seeing?

Steve