Content hidden during valid times

I’ve used this plugin without any issues for a few years now, but recently I’ve had a few complaints that our students aren’t able to see a form that should be displayed between 5pm and midnight. I have not been able to reproduce the issue myself, but all 3 students reported that they are using Chrome on Windows. One staff member provided a screenshot from iOS showing that no form was displayed during a valid time.

I recently migrated this site from on-prem to our public web host (SiteGround). Since I had no issues while it was on-prem I’m leaning towards a hosting issue. I was wondering if this could be a possible caching issue that can be configured with the SiteGround Optimizer plugin. I may open a ticket with SiteGround support to ask them, but I wanted to run it by here as well. Any history of caching causing an issue with this plugin?