Multiple `?_vogue_nocache` in same URL

[kaatt]

I'm seeing requests like

GET /style.css?_vogue_nocache=1468957215136?_vogue_nocache=1468957238055?_vogue_nocache=1468957243715 0.637 ms - 27758
GET /style.css?_vogue_nocache=1468957215136?_vogue_nocache=1468957238055?_vogue_nocache=1468957243715?_vogue_nocache=1468957245865 0.495 ms - 27760
GET /style.css?_vogue_nocache=1468957215136?_vogue_nocache=1468957238055?_vogue_nocache=1468957243715?_vogue_nocache=1468957245865?_vogue_nocache=1468957296296 0.453 ms - 27762
GET /style.css?_vogue_nocache=1468957215136?_vogue_nocache=1468957238055?_vogue_nocache=1468957243715?_vogue_nocache=1468957245865?_vogue_nocache=1468957296296?_vogue_nocache=1468957313872 0.519 ms - 27763

Clearly, it should just have one instance of _vogue_nocache. Instead of getting replaced, it gets appended.

I've got an express server running, vogue running, and the vogue script injected. Seems like a normal setup to me.

Is this a bug or am I doing something wrong?