So back when I was using a basic Spiral Knights account, I wanted to buy some energy and found the Starter Pack looked like a good deal. So I bought it. It was a good deal.
Yesterday I converted my Spiral Knights account to a Steam-based account; no issues with the process. But I found myself wanting more energy today and figured 7500 energy was a better deal than lesser amounts, slightly, so I bought some again.
I was pretty surprised to find the bonuses for the Starter Pack in my inbox again. I reflexively accepted them, too, but I'm not going to use them in case you want them taken away. So I now have two Static Flashes, two Green Wards, a Heat Amplifier, more Mist Tanks than I'll ever use because I kept forgetting to use the original ones and now have double the number, and various slot unlockers.
I'm pretty sure this isn't intended behaviour, right?
Technically, you are transferring your characters over to a new account. I'm not sure if they thought about this issue, though.