Configuring preferences and options in Outlook.com
Hi,JonnyP65 .
I'm Jen, I'm also an Outlook user just like you. I'm not working for Microsoft but I'd be happy to help you figure this out.
Have you tried signing in to a different browser to see if the same issue will occur? If it's only happening in chrome, I'd suggest cleaning your browser's cache cookies and site data. Once you're done, relaunch the browser and check if the emails are no longer missing in your inbox.
Feel free to share how it went.
Kind regards.