In IE8 - Square appearing instead of Dot on Custom hovering

Hi Team,

We are currently using:-
BuildDate Wed Mar 05 15:52:00 IST 2014
Version 4.1p
SCVersionNumber v9.1p_2014-03-05

Problem statement: In IE8 browser - Square is appearing instead of Dot on Custom hovering.

I have accessed the below sample example on IE8 browser and seen the same issue:-
http://smartclient.com/?skin=Simplicity#chartCustomHovers

Please let me know how can we show Dot on hovering in IE8 browser.