Text repeating across all posts

Hello. My site is very new. I only have a few pages and one post. Whenever I try to make a new post I title it and even if I write nothing, a line of text “universal travel adapter” shows up in the text of the post. It also shows up at the bottom of the text in the one post with content. Yes, it’s about universal travel adapters, but I’ve tried to get rid of the text at the bottom of that post and I can’t & it shows up in every post. What can I do to get rid of it? Thank you.