Hi,

Your problem is on the client side. OpenLayers is now requesting tiles with 
256x256 pixels. The middle tile has not any point inside its bounding box and 
therefore no symbols are rendered. Configure OpenLayers to do single tile 
requests.

http://dev.openlayers.org/examples/single-tile.html

Posts from gis.stackexchange dealing with this common issue with tiling clients:
https://gis.stackexchange.com/questions/198450/need-clarification-on-geoserver-meta-tile
https://gis.stackexchange.com/questions/87116/geoserver-cutting-off-symbols-close-to-tile-edges/87123#87123
https://gis.stackexchange.com/questions/83033/single-tiled-mapserver-wms-to-avoid-labels-and-features-cut-along-tile-borders-a

Duplicated labels is another version of the same issue
https://www.geowebcache.org/docs/current/concepts/metatiles.html

Using some tile cache program like MapProxy, MapCache of GeoWebCache between 
OpenLayers and WMS is another way to resolve the problem.

-Jukka Rahkonen-


-----Alkuperäinen viesti-----
Lähettäjä: mapserver-users <[email protected]> Puolesta 
Leehan
Lähetetty: perjantai 27. maaliskuuta 2020 11.27
Vastaanottaja: [email protected]
Aihe: Re: [mapserver-users] layer with "truncated" symbols 2

following your advice, I added quedalle classe :

...
LAYER
        NAME "nombre de cas"
        TYPE POINT
        PROJECTION
                "init=epsg:2154"
        END
        EXTENT 276838.0988 4584246.823 909596.998 8872270.142
        CONNECTIONTYPE POSTGIS
        CONNECTION blabla
        LABELITEM "nb_cas"
        CLASS
         EXPRESSION "quedalle"
         STYLE
                SYMBOL "circle"
                SIZE 150
                COLOR 0 0 0
         END
        END
        CLASS
                STYLE 
                        SYMBOL "cas"
                        SIZE [ln_nb_cas]
                        COLOR [couleur]
                        OPACITY 70                      
                END #fin style
                LABEL
                        COLOR 0 0 0
                        OUTLINECOLOR 255 255 255
                        FONT "verdana-gras"
                        TYPE truetype
                        SIZE 8
                END
        END #fin class

And indeed I am using an attribute for red circle size.
But the result is still the same.
(I can't believe I am the first to experience this issue!) If it can help, here 
is a snap with the dummy class :
<http://osgeo-org.1560.x6.nabble.com/file/t372757/map.png> 



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