How to remove scroll from tooltip plugin Tooltipster?

Good time of day, friends.

There is such a project: jsfiddle.net/tek0gy57/5/

I am using Tooltipster plugin for tooltips.

I don’t understand for what reason, I get a vertical scroll when hovering over the first and second links.
But if you remove the cursor and hover again – it is displayed normally. What’s the magic?

I realized that the reason is in the images (icons) that I use, because there is no such strange effect on the 3rd link.

Please tell me how to make it so that the vertical scroll does not appear when hovering over links 1 and 2. Thank you.