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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 below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
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Or for longer, use three backticks above and below the code snippet:
longer
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 18.0.2): 19.0.0.12
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): Nginx 1.19
PHP version (eg, 7.1): 7.4
The issue you are facing:
Good day!
May I ask you for help?
I have installed nextcloud 19, and I noticed that when I edit a text or table file in the onlyoffice editor, then I save it, then the file change time is not absolute, but relative. That is, for example, I created a file, went in, wrote something in it, then closed it, then opened it again and edited something, closed it again. In the web interface, I see that the file was changed not a few seconds ago, but a few minutes or ches, when I opened it and edited for the first time.
Is this a bug? or is something wrong with me?
Thank.
Is this the first time you’ve seen this error? (Y/N):
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE