Can’t save order any more

Can you try to clear your browser cache? See this post for a similar issue https://www.ads-software.com/support/topic/not-working-after-1-5-3-update-convarrtoobj-is-not-defined/

I confirm I deleted yesterday before even noticing this issue all Chrome caches and history. I see some similar message in webmaster tools:
‘
cb=gapi.loaded_0:164 Failed to execute ‘postMessage’ on ‘DOMWindow’: The target origin provided (‘https://accounts.google.com’) does not match the recipient window’s origin (‘https://cgelves.com’).
(anonymous) @ cb=gapi.loaded_0:164
‘
However, also using FF browser [which I never do for work on my websites, and am not logged into google account on it] does not enable me to save the order of category nor to nest it.

on FF:
Response headers (0 B)
cache-control
public, max-age=31536000
cf-cache-status
MISS
cf-ray
3f3cfd33ad250d01-ATL
content-encoding
br
content-type
text/css; charset=utf-8
date
Tue, 27 Feb 2018 17:50:54 GMT
expect-ct
max-age=604800, report-uri=”ht…com/cdn-cgi/beacon/expect-ct”
expires
Wed, 27 Feb 2019 17:50:54 GMT
last-modified
Fri, 23 Feb 2018 01:02:53 GMT
server
cloudflare
strict-transport-security
max-age=15552000; includeSubDomains; preload
vary
Accept-Encoding
x-content-type-options
nosniff
X-Firefox-Spdy
h2
Request headers (0 B)
Accept
text/html,application/xhtml+xm…plication/xml;q=0.9,*/*;q=0.8
Accept-Encoding
gzip, deflate, br
Accept-Language
en-US,en;q=0.5
Connection
keep-alive
Cookie
wordpress_sec_4a49b4ceefe77400…wp-settings-time-1=1519753498
Host
cgelves.com
User-Agent
Mozilla/5.0 (Windows NT 10.0; …) Gecko/20100101 Firefox/58.0

Failed to execute ‘postMessage’ on ‘DOMWindow’: The target origin provided (‘https://accounts.google.com’) does not match the recipient window’s origin (‘https://cgelves.com’).
edit.php
Content Security Policy: Ignoring “’unsafe-inline’” within script-src: ‘strict-dynamic’ specified
Content Security Policy: Ignoring “https:” within script-src: ‘strict-dynamic’ specified

On FF I managed to save when dragging to a new position but not to nest.

I can not change order of categories. I have read all the posts regarding this issue, have cleared browser cache, have tried other browsers (with cleared caches) have no javascripts errors, have disabled all other plugins except this one and woocommerce and still have no success! What now?