InDesign Text Variables - Bug

Hi,

I have 4 text variable in InDesign document, which has about 150 characters length. For example,

1. Journal name: (Copy from my specified paragraph style)
2. Year: 2013 (custom text)
3. Volume: 13 (custom text)
4. Issue:8 (custom text)

When I insert, all those text variable into some paragraph (exactly as inline with other texts), InDesign kern the complete line of text so tight in such a way no one can read. I guess that InDesign count all those variable characters just as 4 characters irrespective they hold 150 characters length. Here is the screen shot pasted. Please advise how to resolve the issue.