I have a quick action button on my Lead object which opens a flow, when pressing the button on Salesforce1 via the scratch org, the flow opens in the app appearing optimised and fit to the screen, however when I load the same button when logged into my sandbox (on the same phone), the button redirects to the inbuilt browser which loads the flow. The flow page loads as if its on a desktop and is quite small and needs scrolling to see all the text.
Why is the behaviour different?
I have checked and both button have the following settings:
Behaviour: Display in existing window with sidebar