Why does the text move slightly to the left when using hover on the first hover?

Question

css

Because of what, when you first hover over text with hover, it moves a pixel to the left?
When you hover again, it no longer changes its position and everything is fine.
On hover, only the color of the text changes.
And this is not the case with all the text, there are words that do not react to this in any way, although they are in the same menu and with the same settings, but half of them will definitely move to the left on the first hover.