Thx a lot for E@asy answering me in such quick response!
I have check the code in ubb_forum_sumary.cgi, that is correct. No missing that string.
However, as many ppls of my board pointed out the problem of abnormal display of counting, finally yesterday I disabled the cache function of UBB, then seems it is normal now. The problem, can be said to have a temporily solution.
Finally, thx a lot for E@asy help~ Nice to hear your effort on the hacks, well done!