4 camera lense bug - See through camera

Hoping somebody can help! I've setup a 4 camera lens, but when I press the bottom right camera and it fills the screen I can see the other 3 behind in the picture.. This only happens with the bottom right camera. Does anybody have any suggestions as to how I can resolve this? Please see attached images below.

https://ibb.co/5Wt6nTN
https://ibb.co/6tBtNB3

Answers