Tag not firing in specific computer

I have a virtual page view tag triggered by a data layer event.
The tag fires on my phone and one pc but does not fire on 3 other pcs.
The event fires on all devices.
Since the tag is triggered by the event and the event always fires how can the tag only fire on some devices.

I have the same tag on another account that works on all devices.

I am new to piwik so just wondering if I am missing something.

Hi robooko,
Welcome to the community!

Would it be possible for you to share the URL of the site that you are experiencing the problem on? You can either send it here under the thread or dm me.