this is because you put
pointstyle: 'dash' in your dataset attributes.
see chart.js doc about linechart data structure (
pointstyle is at the last row of the table) :
the style of point. options are 'circle', 'triangle', 'rect', 'rectrot', 'cross', 'crossrot', 'star', 'line', and 'dash'. if the option is an image, that image is drawn on the canvas using drawimage.
you have to choose between the different options.
note that there is no
if you want to remove the point style, you can :
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