Some Note 3's also suffer from this, and people got it replaced due to defect or just lived with it, my Note 3 didn't have it. But I have seen some with very big gaps. Manufacturing error It seems.
// LG G3 (D855) // Stock // Stock //
S3(White) > M7(Red) > Note 3(Black) > Nexus 5(Black) > M8(Gunmetal) > LG G3 (Titan Grey)