Visual Studio deploy debug mode

Hi.
I got a problem.
Some times when a deploy a solution with visual studio, on select “Release” my app starts in debug mode.
This is correct or i have missed something?
Kind regards.

What do you mean by “Starts in Debug mode” ?

Sorry, i apologize, i think is in debug mode because i have a low fps ratio.
Its because i have in Player Settings → Other Settings → Vertex Compression V1 checked.
I dont know why this steals all my fps, and do it on Lumia 640 but not in 535.