Hi ismini,
Thank you for your feedback. This is a tooltip bug of contact forum on Joomla 3.1.x that you can fix the issue opening templatesja_lensjsscript.js file at 487th line (before })($query); ), add these codes:
// overwrite default tooltip/popover behavior (same as Joomla 3.1.5)
$.fn.tooltip.Constructor.DEFAULTS && ($.fn.tooltip.Constructor.DEFAULTS.html = true);
$.fn.popover.Constructor.DEFAULTS && ($.fn.popover.Constructor.DEFAULTS.html = true);
$.fn.tooltip.defaults && ($.fn.tooltip.defaults.html = true);
$.fn.popover.defaults && ($.fn.popover.defaults.html = true);
Remember to clear System Cache after saving changes.