I've just got an Asus laptop with Windows 10, nothing special. I'll give stashing the plants a shot, I haven't tried that yet!
Edit: That worked for a few minutes, but immediately after buying a third plant the issue arose again, and stashing the plants won't fix it this time
Huh, jeez. Again, sorry about that. My only other advice would be trying to delete your game and reinstalling, and also erasing your save file and starting again. You could also play in browser. I'll try and see if I can replicate it, but there's something weird happening on your laptop that doesn't happen on mine when I test.