Hi Allie,
I think I found the problem cause. If you make your desktop browser window smaller so you can check it as a mobile view, and try to scroll down and then up you will see that the top menu just jumps a little bit as soon as you go from none sticky mode to sticky one.
If you fix that you will be able to overcome the go-to-bottom icon problem. To fix that please go to your Header builder and the Bar which you set the sticky mode on. Then try to play with the options also with the bar height option to make sure you do not have that jumping problem.
As soon as you fix that the problem that you mentioned in the question should be fixed.
kindly get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case if you still have problems.
Thank you.