Realforce R3 with rattling sound under the space bar, coming from the case

Hello everyone,

I recently bought a Realforce R3 (R3HD11) and I really like it, but I've noticed something that I'm not sure is normal, and I'd like to know if anyone else who has one has experienced the same thing, and if there's any way to fix it.

It doesn't really affect the experience or the sound, but a keyboard at this price point shouldn't have something like this.

Returning it is not an option, and selling it... sometimes I consider it, even though it works very well and the typing experience is ideal :)

Thanks in advance!