The key point to note here is that you are likely using HTML output with the HTMLBlue style. This is an ATTRPRIORITY=COLOR style, which means that only colors are cycled first holding line pattern and symbol to the first one till the 12 colors are exhausted. Then, the line pattern and symbol shift to the next value. Most other styles are ATTRPRIORITY=NONE, including JOURNAL, LISTING and so on. These styles cause the color, line pattern and symbols to be cycled together.
You can change this behavior for any style by setting ATTRPRIORITY in the ODS GRAPHICS statement. This will be applicable till the this is changed.
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