Problems with subforum and calender

 

I have a big problem. I have started 3 subforum and i have 3 topics with same name but in 3 subforum. And when i change the subject or the date in the calender it will change all of the 3 topics with same name. Can somebody help me with this problem? Because i cant change name for 1 topic or put one topic in the calender when i do this i change all 3 topics automatic and put them in the same date but it is differant dates

 

Please help me.