Hi. Thanks for your question.
If I understood your question correctly, I’m unable to replicate such behavior on my local test site with Twenty Fifteen theme. Please watch this GIF animation for reference.
Please follow our Testing for Conflicts Guide and see if that helps narrow down the cause of this.
Let us know what you find out.
Thanks.
P.S. KrystalKnapp, in this forum we try to keep our threads focused on just one issue to ensure we answer each question. Please start a new thread for your issue. Thanks for your understanding.