ok
but some time nesesary, i have no problem on all my computers
my clients have on theirs(windows 10 ie )
for now it s demo :
some page do something like that
$.get('/get_im.php', ..............
and gets data
data is some vars - x1 x2 x3 ....
then str12 = "text" + x1 + "text" + x2 "text" + x3 + ....
that string has also tags - span and div
then
$('#descript').html(str12) and we have at random some symbol ?(that browser can not show) with repeated symbol from original string