listitem(0).art(poster) showing tv show poster instead of season poster in my list

Got a bit of a strange issue.

I have a list filled with the following content, to show seasons on my infoscreen when a TV show is selected:

            <control type="fixedlist" id="$PARAM[id]">

                <viewtype label="widgetlist">list</viewtype>

                <preloaditems>2</preloaditems>

                <orientation>horizontal</orientation>

                <focusedlayout/>

                <itemlayout/>

                <include condition="$PARAM[use_custom_content]" content="Container_Content_Path">

                    <param name="target" value="$PARAM[target]"/>

                    <param name="sortby" value="$PARAM[sortby]"/>

                    <param name="sortorder" value="$PARAM[sortorder]"/>

                    <param name="content" value="$PARAM[content]"/>

                </include>

            </control>

And then the parameters used are:

            <param name="id" value="8010"/>

            <param name="target" value="videos"/>

            <param name="sortby" value="year"/>

            <param name="sortorder" value="ascending"/>

            <param name="content" value="videodb://tvshows/titles/$INFO[ListItem.DBID]/"/>

For some reason ListItem.Art(xyz) shows the tv show-level artwork at position (0). But for any other position, e.g. (ListItem(1).Art(poster), it will show the corresponding season poster.

I made a label to show the source of the artwork and I get the following:

if ListItem(0) is used... tvshow/poster.jpg
If ListItem(x) is used... tvshow/season0x-poster.jpg

Anyone got any ideas...?