Hi @Damon_Daisley_Wilson, thanks for your post. I think that the issue is, that you have a padding set on the Refer a Friend div, and while you have the height set to change to 0px on that element, the leftover padding height is not adjusted, resulting in a total of 10px momentary being displayed, before the whole Refer a Friend element is changed to display:none in the interaction.
You can try to remove the padding on the Refer a Friend element as shown in the screenshot reference: