Map Settings not applied

hi there,
am facing an issue with the network map.
i edited settings in config.php.
almost all changes are noticeables.
except the edges width.

whatever value i fill, the edges have the same width.
i tried https://visjs.github.io and i found the correct setting. on this site, it work.
not on my installation.

here are some screenshots:
my map

my edges section config.php

and the visjs tests:
vis1 vis2

vis4

and, the validate.php result.

Component Version
LibreNMS 1.57-4-g600242789
DB Schema 2019_10_03_211702_serialize_config (145)
PHP 7.2.24-0ubuntu0.18.04.1
MySQL 10.1.41-MariaDB-0ubuntu0.18.04.1
RRDTool 1.7.0
SNMP NET-SNMP 5.7.3
====================================

any clue?
thanks