I am really sorry, but there's nothing I can do about it... your generous donation contributed to the guarantee fund, which increased now to almost it's maximal value. There is no way I can return that without affecting the guarantee fund, and I don't think that every body will agree to just take 0.22 BTC off that fund (there's no way even of asking people about it).

Rules are very clear about, and the deposit limits are very well displayed right below the place you take your deposit address from.
Sorry again.