Thanks! I looked at your file and noticed that you are using a variant icon component. It turns out that the Default Button and Hover Button have different icons (one component, but different variants). Apparently because of this, there is a discrepancy.
You can try to place the same icon in your variants (so that the Default and Hover have, for example, the Dark Plus icon), and check the prototype.
And by the way, a Figma note:
https://help.figma.com/hc/en-us/articles/360056440594-Create-and-use-variants