Hover text on button is inconsistent with its sibling

I have two buttons linking people to my external stores.
They are both styled exactly the same way (the Unity button on the right being a copy of the Artstation button, on the left)


The hover state of the Unity button should look like this:

However… the “Unity Asset Store” looks like this (you can see the text grows in height and looks off - like its fuzzy):

The button and text are direct copies, so there’s no explanation for this that I can find. Is it a bug? The problem is visible on the live site too - but only on desktop…
Seems to look ok on my laptop and lower breakpoints dont need hover states.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)