Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the following as you can (you can cut and paste this into your topic):
Nextcloud version (eg, 10.0.2): 11.0.4
Operating system and version (eg, Ubuntu 16.04): Ubuntu 16.04.3
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.18
PHP version (eg, 5.6): 7.0
Is this the first time you’ve seen this error?: yes
Can you reliably replicate it? (If so, please outline steps): no
The issue you are facing: Web view shows multiple (duplicate) files which is not consistent with sync client or looking at the file system.This is not happening in all directories. In the particular directory there was a file that was complaining in the sync client. The user mentioned it to me. I checked the file system and it wasn’t there. Tried to ‘delete’ using the web page (file not there) and all files that are there now show full path.
It’s like the web page is cached with old data and I can’t figure out how to clear. Tried clearing Apache (apache-htcacheclean), Redis w/o luck. I’ve tried scanning the system w/ occ for all users, particular users. Nothing seems out of place in oc_filecache.
When this started I was on 11.0.2 and moved to 11.0.4. Unless I hear something I’ll try moving to 12 and see if that helps.
The output of your Nextcloud log in Admin > Logging:
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
The output of your Apache/nginx/system log in /var/log/____:
Remember, this information may be requested if it isn’t supplied; for fastest response please provide as much as you can 
Feel free to use a pastebin service, otherwise log files can be indented with 4 spaces on each line to present them in a friendlier way on the forum.