Hello Dima, thanks for your explanation. I tried on different devices and browsers, the same result. Does the location on this map work for you:
? Could it perhaps have something to do with httpS?
As for categories in a few columns.
Today group list consists from UL tag and LI element for each group.
I can change it, add ability to change style just for using DIV tag. In this case if you just set style like "float: left" for class for this div, it will be displayed in a few lines. Like you can see in my extension in admin panel - extension dashboard.