Thanks for the help but to no avail.
However, each time I take a step forward I feel like I take 1.1 steps back. 
Although I never really use Safari. But I tried the App in Safari and the OBJ displayed correctly.
Only Chrome, Edge and Brave do not display the OBJ on MacOS. Safari displays the OBJ as intended.
GIF BELOW:
The downside is that I have to click on the load buttons is Safari 1-3 times to get it to load, whereas Edge and alike load after the first click.
Thanks everyone for your help. But there appears to be no solution.
I have put in Feedback to MS Edge and Chromium… hopefully, they fix it on MacOS.
It is an existing issue
WEBGL CHROMIUM ISSUE
Of Note this is the same issue:
[paid] help resolve bug either in threejs or chromium
On MacOS don’t use Chromium Browsers use WebKit Browsers (Firefox, Safari, DuckDuckGO)