I wish when I hovered over the upgrade buttons, it didn't just flash the numbers of what it would change. I wish when I continued to hover over each of those three buttons, the numbers would persist. It seems like a glitch or other mistake.
EDIT: Oh I see what's happening. When the game is in Auto or perhaps when the game is in movement with towers hitting enemies, the display of stat changes when I hover over the upgrade buttons is interrupted, but when it's not in Auto and it's between rounds, the stat changes persist when I hover, as they should.