Yeah your lower back should be sore, but not in pain. You need to know the difference between good sore and injured sore..
Riding bikes for a few hours can be hell on your back too, by the way.
Check your form on the dl, take a video and post it here or on other friendly sites for people to critique for you. Especially watch for lower back rounding.
How is your stretching routine? Do you stretch your lower back out properly after doing deads?
Chances are there is something a little off with your form and the lower back is taking too much of the strain. This would account for your glutes not being sore. Although my hams have tended to feel it more than my glutes do?
How long have you been DL'ing for? I found after the first few weeks I got very little soreness anywhere. Until I up the volume or intensity or change the program in some other way. For example I recently switched from doing 1x5 DL a week to doing 3x5 DL a week. My lower and mid back were sore the next day, along with my hams and to a lesser extent my glutes. Now a couple of workouts in the effect is less noticable the day after.
Hope this helps.