Student or Learner
We noticed that all the floor lamps delivred were slanted, not straight at an angle.
The floor lamps were made of moulded ploycarbonate. These floor lamps were not moulded straightly, slightly slanted at the top. When we look at the lamp we can notice this defect clearly.
"The floor lamps delivered should have been straight but we noticed that they were curved at the top." If the change occurred abruptly at a particular point, I would write 'bent' instead of 'curved'.