This effect can possbily be caused by several factors:
It is possible that your PST file is corrupted, check and repair the profiles and the PST file (s). We recommend " scanpst ".
Please check if your PST file is registered under Start / Control Panel / Mail / data file. If not, select your Outlook PST file and confirm with "OK." Then select the added PST file as default and restart Outlook again.
If the profile still does not appear, please create a new profile under Start / Control Panel / Mail / profiles and add your PST file into the newly created Outlook profile. How to create a new profile see here.