Does it reload correctly with devtools closed?  By hard reload, do you mean shift+reload?  How are you clearing the cache?

https://youtu.be/Z4FsFjYy6eE

Clear files and images in clear cache doesn't work either, only incognito mod helps

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@mmenke PS. as you can see in the title of the webpage is written Thomas :) and when i open the same site in incognito its written Ability

PS. the files are saved thought Nginx.

Request Method: GET
Status Code: 200 
Remote Address: xxx.xxx.xxx.xxx:443
Referrer Policy: no-referrer-when-downgrade

RESPONSE HEADERS
content-encoding: gzip
content-type: application/javascript
date: Fri, 23 Mar 2018 09:58:53 GMT
etag: W/"5ab4c250-2b1ab"
last-modified: Fri, 23 Mar 2018 09:01:04 GMT
server: nginx/1.10.3 (Ubuntu)
status: 200
strict-transport-security: max-age=63072000; includeSubdomains;

REQUEST HEADERS
:authority: xxxxxxxx.xxx
:method: GET
:path: /xxxxxxxx.module.25a4d184071f35d22774.chunk.js
:scheme: https
accept: */*
accept-encoding: gzip, deflate, br
accept-language: en-GB,en;q=0.9,hr-BA;q=0.8,hr;q=0.7,en-US;q=0.6,bs;q=0.5,de;q=0.4
cache-control: no-cache
cookie: authToken=xxxxxxxxx
pragma: no-cache
referer: https://xxxxx.xxxxx/
user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

Do you still run into the issue if you navigate a tab to the site, close all tabs with the site open, clear the cache by going to chrome://net-internals -> click on the little triangle in the upper right -> clear cache, and then open the website in a new tab?

I'm trying to figure out if this is an issue with the on-disk cache not clearing correctly, or if it's an issue with either devtool's reload behavior, or the renderer process's in-memory cache.  Different people are familiar with each area, unfortunately.  Those instructions will check if the on-disk cache is the issue.

ping reporter: can you please respond to comment #6? Thanks!

#6 Yes same issue. Chrome still shows (from disk cache) for the index.html. I even tried now to add a cache header explicit for index.html "no-store" but chrome doesn't care and always serves it from disk cache.
The only thing that helps is Settings -> Advanced -> Remove browsing data.

I found the issue.

Angular cli / webpack was searching the folder for appcache manifest files, and found a sample file and added it to index.html of the web application from the pdftronwebviewer which instructed it to (APP)cache index.html.

So the issue is DevTools[disable cache] / Empty cache and hard reload is not clearing the App cache anymore since this version. Clearing it manually in the devtools application tabs seams to fix the problem

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Adding appcache label, per comment #9.

Empty cache and hard reload is working as expected. App cache is deprecated tech, sw / cache storage substituted it.