I deleted the two field from demographics, then the system worked perfectly. After test it for a while, I added a demographic with the same ID of one of the deleted fields as a text field, and surprisingly all the data was recognized and all the students has their demographics updated.
I deleted the two field from demographics, then the system worked perfectly. After test it for a while, I added a demographic with the same ID of one of the deleted fields as a text field, and surprisingly all the data was recognized and all the students has their demographics updated.