Given that they fold, it's very likely they were placed against something with rust. That possibly being the underside of another chair.
It's based on WireGaurd with some added benefits. Free for up to 3 users. I've had no issues with it and even use it for corporate networks. An alternative is ZeroTier, while I haven't used it I hear a lot of people recommend it too.
If they originate from kbin, it's a known issue. The timezones aren't properly set in the federated data.
@Xyre
@lemmus.org