In the ZC database changing the character limit of the field you're having a problem with will allow the field to hold more characters.

To troubleshoot we'll need to know the order/flow you are collecting data from start to finish.

Recently I dealt with a client moving data from eBay to ZenCart using exceptionally long product_name fields. Changing the ZC db field character length fixed the problem only because it flowed like this:
eBay-> Data Compiler-> .csv -> ZenCart-> Easy Populate-> Import .csv