I did the following step if I remember correctly.
Add one data point (offset=0) for Modbus IP publisher. I works. Add two more data points. Only offset=0 is working. The other data points are 0. Remove all data points, except offset=4 and set to offset 0. It works again. Add back the previous data point which was offset=0 to offset=4. It works.Do something like steps 4 for others to make it work. It seems to me that the data points has to set to offset=0 and then change to other offset value to make it work. But I am not very sure.