I have this issue too, the preview generates the correct, and wanted data merge result but when executing the final data merge, it seems to reuse an entry at random.
As per Jolene's comment, creating a brand new document does fix this issue temporarily, but this is not a particularly efficient work around.
I have this issue too, the preview generates the correct, and wanted data merge result but when executing the final data merge, it seems to reuse an entry at random.
As per Jolene's comment, creating a brand new document does fix this issue temporarily, but this is not a particularly efficient work around.