No clue if anyone did this but there's a bug where the Solar Flare (Sunflower's Q) would charge instantly after killing one zombie with collecting a sun orb thing (the ones that heal you) fixing it
(While I'd like for it to be kept I'll report it due to it not being intentional/Balance concerns)
Viewing post in Plants vs. Zombies: The RPG comments
Thank you for letting me know. This is quite a massive bug, so I immediately fixed it.
If you're interested in knowing why this happened, you were right in thinking the Healing Sun was related to it. The remaining cooldown of the Healing Sun was overwriting the remaining cooldown of the Solar Flare.
I won't force people to update, so you can still choose to use this version to play with other people if you want to lol