I suspect those grips were for an early version and your hanging them on a newer version and need to be modified.
Many of the aftermarket grips of course are made on machines and machine checkered. I laugh so hard it hurts when I see add checkering 5 bucks. It takes me 8 hours or more to hand checker a pistol handle. 5 bucks don't seem like enough, perhaps what I'm worth but not lucrative.
Some makers lean towards tight perfect fit and little clearance between wood and controls etc. I tend to lean this direction. Others leave a much looser fit and they are alot more forgiving fit wise.
As quickduc points out 1911's have been around 100 years and everybody that makes handles make 1911 grips. They are pretty easy to fit and most of the ones Ive made I built on my 1942 Colt, yet they still fit shiney brand new Wilson's, Kimbers, and even a Randall for a new friend in Arkansas.
Good things don't need changing.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."