Why is my Walgreens WBA contribution buying WBA at $18 vs $11 it shows as the value?

Have been working for Walgreens since 2009 and my contributions go to a Roth but the company match contribution goes to a traditional 401k and part of their contribution goes into WBA.

I looked at the allocations and the last few months $19 has been put into WBA but only purchased 1 share or a hair over. I'm guessing it makes sense somehow but I'm not really knowledgeable about a lot of this.

Hopefully I explained enough, just trying to figure out why I am only buying 1 share with $19 instead of almost 2 with the company match part of the contributions.