docs-site/faqs/extra-characters-appearing-on-cards.mdx
Sometimes users notice that text is appearing in front of or on their cards that they don't remember putting there. Usually it is just a couple of letters or nonsense. For instance, on the front side of your card you have written book, but when you review the card it appears as fybook.
This problem is caused by accidentally placing text in the card template. You can solve it as follows:
After you close the Cards dialog, your cards should appear as normal again.
If you don't have access to the computer version, you can study such a card in AnkiMobile, then tap on Tools>More>Edit Card Template.