This issue appears to be something happening outside of Webflow, but I thought I would put it out there to see if anyone else has experienced similar issues.
On the homepage of this site, I have a page load interaction (legacy) that makes the main slider fade in from 0% opacity to 100% opacity. All works well in my Webflow published site. I handed the packaged site over to my developer (using Drupal backend) and this same interaction sticks at the 0% opacity initial appearance, but only in Safari and Explorer Edge browsers. Both browsers act normally once I refresh the page or click the home button. When I inspect the page, nothing appears differently in the code that would make the interaction stall upon first load. I can understand Explorer having some bugginess but never had an issue with Safari. And strange that both browsers have the exact same response.
I should also mention that there are similar page scroll interactions (legacy) further down the page, where large images transition from 0% opacity to 100% opacity upon scrolling into view. Those remain at 0% as well, until I refresh the page. Again, only in Safari and Explorer.
This is my Designer link:
This is the webflow published link:
This is the Drupal integrated live site: