Custom DOE, 4 continuous factors, want to add replicate runs

[#1]

I am creating a DOE with 4 continuous factors, including 2nd order interactions and quadratics. I would like to add replicate runs. 

I tried typing 5 into the replicate runs box before creating the design, but the design that was created did not have any replicates. The number of runs was 20 and all were unique. I understand replicates to be running the same set of conditions more than once.

Am I misunderstanding what a replicate run is? or am I setting up the DOE incorrectly when I create it?  

[#2]

I was working on an answer for you. I could not re-produce the problem. I saw your your latest post and was relieved. Glad it worked for you!