google cloud platform – GAE Skip max-instances configuration?

Regarding the graph, how many times have I been billed? I see billed 2 but in the config I have max-instances 1, standard F1.

Can not publish an image, but the graph shows:
Created 2 Assets 0 Invoiced 1
Created 0 Assets 0 Invoiced 2
Depending on the line of the graph I choose.