So I added som 3. level spells to my warlock today, and suddenly in the pulldown list with the others came the daylight spell!
Is that added somewhere as a warlock spell or is there a small bug in the file?
Is your warlock a Legacy Aasimar? They get to cast Daylight 1 per day starting at 5th level. Because it is a 3rd level spell, it shows up in that list.