When the client merges data with a template, the text ends up bunching up on the left side of the page. I can not recreate on my end though. We are currently using Aspose.Word version 3.0.0.
The first recommendation is to upgrade to the latest version of Aspose.Words. Please take into the account that our root namespace and dll name is changed from Aspose.Word to ASpose.Words. So you or your client need to change this in your apps after upgrade.
We can help you further if you or your client will provide more info about this issue. Problem document, its template, code parts, anything will be very helpful. Until then it is really hard to figure something out.