If you change the code in modules/mod_jevents_cal/tmpl/ext/calendar.php at lines 211-215 from
$class = ($currentDay["cellDate"] == $today) ? "extcal_todaycell" : "extcal_daycell";
$linkclass = "extcal_daylink";
if($dayOfWeek==0 && $currentDay["cellDate"] != $today) {
$class = "extcal_sundaycell";
$linkclass = "extcal_sundaylink";
}
to
$class = $currentDay["today"] ? "extcal_todaycell" : "extcal_daycell";
$linkclass = "extcal_daylink";
if($dayOfWeek==0 && !$currentDay["today"]) {
$class = "extcal_sundaycell";
$linkclass = "extcal_sundaylink";
}
it should resolve this issue