The "View in 3D" button opens the wrong model

In my instructable Blind Music Player when I click on "View in 3D" next to the "buttons.stl" file I see some other model.
Maybe it's called "buttons.stl" too but that's not my model.

Tested with Google Chrome Version 61.0.3163.79 (Official Build) (64-bit) and Firefox 52.3.0 (64-bit).
Debian Stretch 64 bit.

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