Menu scrolling disabled on iPhone if calendar is in background

Subject says it all. To duplicate this, open up a site on your phone, go to the calendar and then go back into the menu. You can't scroll the menu: only the calendar scrolls.

We will need the operating system of your phone and version.
The browser and version

It works correctly ony Android with chrome.

Of course. My error for not including.
iPhone 6S, iOS 11.4, and Firefox, Chrome and Safari browsers all up to date. I don't think the versions matter-it's the OS.

My iPhone 6 iOS 11.4.1 works

I’m not sure what you’re doing right, Pam, but no matter which site I go to the behavior is the same. I shot a very short video with my iPad to demonstrate. . This is on champagnetoastmasters.

did you try the reload link at the bottom of your site?