I noticed that in the published reports on the PowerBI Service, the arrows to scroll down (see right column of screenshot) are not rendered properly and are being cut off, making it hard to see that the data is scrollable. As you can see, the upwards arrow (see left column of screenshot) is unaffected and renders correctly.
This issue does not appear in the PowerBI Desktop where everything loads as expected:
Still could not reproduce it in my side when I have tested on the Edge, it works fine.
But I found a similar phenomenon that when creating the visual firstly in Power BI Desktop, it seems like the arrows would not show after I disable the Responsive option and re-enable it since this option is enabled by default.
Perhaps you can try it and republish this report to Power BI Service again to check.