By default after clicking a location marker on a small screen brings up a fullscreen overlay that holds the location details:
You can use this CSS snippet to see the Location Bubbles (like on desktop resolutions) instead:
CSS
.open-user-map #location-fullscreen-container {
display: none !important;
}
body.oum-location-opened {
overflow: auto !important;
}
The result will look like this: