Strange behavior in a bar chart

Although I did set the “width’ in de advanced appearance of the series , almost all bars do accepts this value (0.2) (see example 1) but some do not (see example 2) At the same time when the “width” is not accepted by the bar, strange values show up on the X-as. The X-as should show weeknumbers (calculated by a workflow, as calculated attribute of the graph source table. Regarding the construction I should expects interger/weeknumbers. See the added screenshots. Anyone suggestions where to look for?  
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