Countup Timer – Seconds Not Working

Hi there. I have activated this plugin and everything was working as expected but the next day when I returned to continue my work on the page I noticed that the seconds on the counter are no longer counting up on the page. I assumed there was some sort of plugin conflict and tested the plugin on another website – it worked great so I continued trying to find the issue on the initial website. Fast forward to today, I checked the second testing website and the seconds have stopped counting there as well.

I have tried deactivating and even deleting and reinstalling the plugin but nothing seems to resolve the issue.

Any help would be appreciated.
Thanks,
Sara