Huge latency on Windows

I'm having a bit of an issue with libsoundio. For some reason, on Linux, the library works perfectly OK—I set the latency to a very small value (like 0.001), and as expected, it works perfectly. However, when I try to set the latency on Windows, the effective latency is huge (up to 8s), and this was reproduced by multiple users on multiple different machines.

Here's my bit of code where I instantiate the device, set the write callback, etc.

https://github.com/liquid600pgm/rapid/blob/master/src/rapid/audio/device.nim

Is there anything I'm doing wrong, or is this an issue with soundio?