Markercluster group: popup is displayed under the other markers
Considering a markercluster group:

If I click on the bottom marker, its popup is displayed under the other markers:

Simulated in local mode (to have the latest version of IoT Map Component) with the following Knobs > markersList data:
{
"id": "s1",
"location": {
"lat": 44.895,
"lng": 4.87
},
"template": "square",
"status": "warning",
"tab": {
"content": "H",
"type": 0
},
"shape": {
"type": 1,
"anchored": true,
"plain": false,
"color": "#FFCC00"
},
"layer": "default",
"inner": {
"color": "black"
}
},
{
"id": "s1000",
"location": {
"lat": 44.895,
"lng": 4.87
},
"template": "square",
"status": "warning",
"tab": {
"content": "H",
"type": 0
},
"shape": {
"type": 1,
"anchored": true,
"plain": false,
"color": "#FFCC00"
},
"layer": "default",
"inner": {
"color": "black"
},
"popup": {
"title": "title",
"body": "Lorem ipsum"
}
},
{
"id": "s2000",
"location": {
"lat": 44.895,
"lng": 4.87
},
"template": "square",
"status": "warning",
"tab": {
"content": "H",
"type": 0
},
"shape": {
"type": 1,
"anchored": true,
"plain": false,
"color": "#FFCC00"
},
"layer": "default",
"inner": {
"color": "black"
}
},
Nb : if you first open and then close the popup of one of the markers on the top, then the marker will have an appropriate z-index (like from z-index: 1000411 to z-index: 411) and will be under the popup of the bottom marker.
You can have a quick fix with :
.leaflet-marker-icon.iotmap-divicon.leaflet-zoom-animated.leaflet-interactive[style*="z-index: 1000"] {
z-index: 300 !important;
}
But it is a dirty quick fix. The click on a marker is not always easy as they all have the same z-index. The value of the z-index after having closing the popup is the real appropriate one.
Another quick fix using the width of an opened marker :
.leaflet-marker-icon.iotmap-divicon.leaflet-zoom-animated.leaflet-interactive[style*="width: 50px"]:not([style*='opacity: 0.3']) {
z-index: 10000000 !important;
}