Funny you say that as I just started a thread based on my observations of this. I have the exact same thing happen on our place. The deer hammer plots the hardest right after spraying.
I don't know what gly tastes like but my deer like it! Or maybe the plant nutrients and chemistry change shortly after spraying and they are more tasty. I don't know which it is but they sure like it. My hope is that it acts as a steroid I start seeing huge non-typicals.