Hello,

The cause of this issues lies probably in the fact that the same column (NewsSummary) has different sizes in those Kentico installations. It seems that the mentioned column has a larger size set up in the exported site that in the destination instance. Please check this field definition in CMSSiteManager / Development / Document types / News / Fields / <NewsSummary> and check it's set the same way as on the source site.

Best regards,
Boris Pocatko