Groups field counting elements failed

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Steps to reproduce

1. create a contact in Contacts app, enter few groups
2. change the width of the display by changing the width of the browser page

Expected behaviour

The number of the fields in the group including +# shall be constant and true.

Actual behaviour

The number of the fields in the group including +# is not constant and is false.

In the example, three groups were chosen. Count 2 or 3 is shown depending on the display width.

(I have seen count +1 or +2 with other contacts, so summing and subtracting somehow works in the background... I quess)

Server configuration

Operating system:

browser: Firefox Quantum 78.0.2 (64-bit)

Web server:

Database:

PHP version:

Nextcloud version: (see Nextcloud admin page)

NC 18 (ecloud.global)

Updated from an older Nextcloud/ownCloud or fresh install:

Where did you install Nextcloud from:

Signing status:

Login as admin user into your Nextcloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

Nextcloud configuration:

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or 

Insert your config.php content here. 
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

Are you using external storage, if yes which one: local/smb/sftp/...

Are you using encryption: yes/no

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...

LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your Nextcloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';


Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration

Browser:

Operating system:

Logs

Web server error log

Insert your webserver log here

Nextcloud log (data/nextcloud.log)

Insert your Nextcloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...

Start by reproducing the Contacts app issue with a contact assigned to several groups, then resize the browser window and compare the displayed group count. Trace the frontend behavior responsible for the group list and its +N count; done means the count remains constant and accurate across display widths.