Definitely should not feel it in your lower back mate IMO.
If you are it is because you are using your erector spinae as hip extensors which (as has been suggested) is usually because your form is off.
Your erector spinae should be used isometrically to brace your lower back and hold your lumbar spine in place, your arse and hamstrings should be the ones extending at the hip.
I have a long history of pulling like a mongoloid my lower back would be so sore from some sessions that my back would sieze up when I walk away from the gym. I would have to sit down for 20 minutes just so I could walk home! (thought this was normal at the time).
Now that I try and use my quads to get it past my knee and push my arse forward to lock out lower back is much better.