Hello, do you want to stop read receipts completely or only avoid seeing these unexpected ones?
In Outlook on the web, go to Settings, then Mail, then Message handling, and turn off “Send read receipts.” Then go to Mail, then Compose and reply, and set “Read receipts” to “Never send a response.” This stops Outlook from sending or responding to receipts and prevents confusing entries from appearing. Also check Settings, General, Language and time, and set your correct time zone so any system generated timestamps show properly.