It's difficult to diagnose this definitively without seeing the images, burt there is no mode or function on your camera which would do that.
The most likely cause by far is that there is light leaking into the back of your camera. It's a very common fault as the original foam seals are unstable and eventually turn to sticky goo before drying out and turning to powder.
You could replace the light seals, but as cameras similar and even far better than yours are literally ten a penny at any charity/thrift shop and can usually be obtained totally free just by asking around then I have to go against my usual instincts and say don't bother.
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