Hello, we have not encountered such an issue in the latest build that was uploaded. Did you buy the game here in Itch.io?
Viewing post in The Letter - Horror Visual Novel comments
Apologies for the late response! We're already aware of this issue and we'll be making a patch as soon as we're able to. Right now our small team is preoccupied with other things at the moment so we won't be able to commit a deadline. Please stay tuned for updates in the Apple app store.
Thank you and stay safe. :)