What does a slash mean in a full-load current value?
You can see in that datasheet this table:


Those currents (full load currents) are related to input voltage (rated voltage). 

35.6A is for 48V

26.7A is for 60V

UPDATE:

Title of that item is "MY1020 1000W 36V|48V DC-Motor 3.2 Nm", but there is no such motor in description. So, whether title or table is wrong. You should ask seller to clarify that.