I'm trying to show in Leaflet a WMS map served with QGIS Server. As you can see in this fiddle below there's a problem with the items in the map; they appear to be clipped somehow. The data which are given by QGIS Server are geographical multipolygons with associated their id in the postgis database.
https://jsfiddle.net/maurizioricci95/vydseLzq/1/
The map is working correctly if imported in QGIS Desktop using directly the WMS URL (http://quegis.labcd.unipi.it/cgi-bin/qgis_mapserv.fcgi). I also tried in Leaflet to request image in PNG format with the transparency but didn't fix the problem.
This is the GetCapabilities of the WMS:
http://quegis.labcd.unipi.it/cgi-bin/qgis_mapserv.fcgi?SERVICE=WMTS&VERSION=1.3.0&REQUEST=GetCapabilities , everything appears to be ok.
It looks like there's some strange behavior/options set in Leaflet but I am not able to figure it out.