My new cue is lighter than expected

Hi guys, I got my new cue last week, it's great cue and looks beautiful. However, I checked the weight, it's a bit lighter than what I requested for.

It's my first time to order a custom hand made cue from U.K., I'm not going to complain, just curious is that normal?

I requested for 18oz and now is 17.56oz.

Thanks.

My new cue is lighter than expected