The very first click and drag on the map is not doing anything after the page has been scrolled. The map becomes interactive only with the second click. If i scroll the page up or down, the map locks up again until the second click.
This is due to the leaflet sleep plugin we use (to avoid the map to catch the mouse while scrolling).
The map is set to wake 750ms after you mouseover. So if you click within this 750ms timeframe, nothing happens.
We can try to reduce it and see if it works better, while not impacting scrolling.