Break Structure and Make Structure

I found an anomali in Blueprint. Please see the image below.

I have a custom structure called FQueueCreature. I made an array of FQueueCreature and tried to set an array element at index 0. I only need to edit a few properties in FQueueCreature and did it like the image above. The anomali is that, the total propery from the array of FQueueCreature is different. When I use “Break structure” it shows a property called “Instinct”. But when I tried to use “Make structure”, it does not let me edit the “Instinct” property. They both should refer to the same thing. How could they be different?

It turns out that the “Instinct” property is “ReadOnly”. Sorry my bad.