Web Site Doesn't Load Once Viewed A Few Times In A Browser

I’ve built the first version of my app’s web site using Wappler. I’m getting this strange thing where once it has been viewed on a specific browser on my computer, then the next time I come to view it the pages don’t load until I clear the browser cache.

Can someone look at the site code and tell me if I’ve done something to cause this?

The site is at www.workshop-angel.com.

Thanks!
Antony.