Barcode not displayed in Adobe Reader

Hello! Friends,

I have designed an adobe form using Livecycle ES3. The objective is to generate bar code after completing the form. Bar code gets generated in Livecycle.

But in Adobe Reader the bar code is generated only when the data is less. When the data is more then instead of bar code a grey bar is shown.

There are about 25 fields in the form. Tried this in Adobe Reader X (also tried in 9 & 8).

Any help/suggestion in this is highly appreciated.

Thanks in advance