Won't cut and paste anymore

Eversince the Mavericks upgrade, I can't cut and paste in the calandar app anymore. Let me try to explain:

Every month, I get a new schedule for work, and I have to manually enter it in to my calander app. It then sinks to my phone, ipad and work macbood air. I only have 2 or 3 different catagories that I use for any given day, and I used to just copy one catagory from, say November 14th, and then click on November 29 and paste the same catagory and time. Now it will only paste on the date that I copied from (ie it'll just put another copy of the same job & time on the same day).

Is this happening to anyone else, or just me?