Today I met a very strange question, everything is ok when I use the simulator debugging , but with the real machine debugging I encountered the following tips:
Ok it seems you are using network calls (downloading something from the internet).
When running on the simulator you are using your computer’s internet but on the device you are using your device’s actual internet connection. This means it needs to be really available and fast.
I cant see your image very well but it seems like there is a connection issue.