Title. Clicking into the wishing banner forces you to choose your rate up construct immediately. You can back out of this, but it takes you out of the R&D menu. When you click back in, you are taken directly back to the wishing banner and have to select a construct to move off of it. This essentially forces a player to use their single choice immediately, or locks them out of the R&D screen.
Either let players cancel and navigate to other banners, or a better option is allow them to change their rate up target until they pull, at which point it becomes locked in.