Stop in for a cup of coffee

So i went to lowes to get some bolts to replace a few missing bolts to put the engine stand together but i discovered the weirdest thing.

They don't stock 9/16 bolts. The bolt isle has 1/2 inch then it jumps to 5/8". When i asked about 9/16, the guy said they have to be ordered, and are expensive.

So i bought the 5/8" and drilled the holes out so they fit.

Weird