Firstly your node list should be unique. You had the same value repeated over many lines due to how you bought in your data.
Secondly, your node list did not capture all the nodes in the network. You simply took your from column and relabelled it name. This would work fine if every value in the to column was also in the from column. This isn't the case in your instance.
In order to overcome this you should take your from field, relabel this name. Then as a seperate stream, take your to field and label it name, then union these two streams together and perform the uppercase, and then the unique.