Hi Dimitri,
I found a bug within the Welcome Tour.
Problem is the same on your demo site.
During the tour, between step 4 (Center & Fullscreen) and step 5 (Search an address), the hotspots on the right side disappear.
If you go back they are displaying again between steps 4 and 3.
Problem is in "tabs-2" style, display change from block to none. I don't know why.