On Button-Shadow hover (.btn-shadow) text in other areas / elements changes slightly

[KeksKartoffel]

Hi,
im using the "Neon Glow" Theme (https://hackerthemes.com/bootstrap-themes/neon-glow/).

When I hover over a shadow button (btn-shadow), the text in the other areas / elements on the page changes slightly.
On Buttons without class ".btn-shadow" it's working fine.

You can see the whole thing on the following gif: https://media-upload.net/uploads/16fcyvigga0z.gif
(Focus on the text in the alerts and on the buttons above the insepector)