I keep receiving Amazon emails with the attachment icon but nothing is included. Hack job?

Good morning.  I keep receiving emails from Amazon which appear to be legitimate since they deal with purchases I recently made over the past 24 hours.  However, the email message appears with the "attachment" icon listed but no attachment is included in the message.  Just wondered if this is a hack situation or not.  Of course, all I did was open the message but did not click on any links inside the message.  Do I need to worry about this situation?  WSA scan did not identify any issues.  Amazon said they do not send out messages with attachments.  What should I do, if anything, at this stage?  Thanks for your help.