Trouble in smooth finish @ the joints

Screenshot 2015-04-25 17.09.27

I am using Shift List to make tea light, but due to unknown reason the point where the two lines meet up is rugged and shows a notice-able rough twisted joint , is there anyway i can get rid of it and get a smooth finish ? Thanks !
I am using Shift List to make tea light, but due to unknown reason
the point where the two lines meet up is rugged and shows a notice-able rough twisted joint , is there anyway i can get rid of it and get a smooth finish ?
Thanks !

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