Launch the dbmlsync with -v+ option, so all the values would be visible.
BTW, is it always the same field, which is updated to unexpected value?
Could it be that the data types of the corresponding field in the consolidated DB is different?
Important (have just noticed it in your answer): You should not have done dbtran using -it option.
The transactions use see in output could have arrived from different tables.
Please translate the log again and this time use -t and -z, and not -it.