Recently I took a series of pictures that include the reflection of a hill on some water. Upon reviewing the pictures I noticed that the right edge of the hill's reflection appears to abruptly end at a certain point. All the pictures I took where within a ~40 foot spot, and the interesting reflection is present to different extents in every one. I am unsure if this is an odd phenomena or me simply not understanding reflections. For reference, the pictures were taken at 64°55'53.8"N 23°19'18.3"W facing north-northwest. Taken with an iPhone Xs with no significant settings changed off default.
So my question is: what would explain this reflection?
Apologies if I am asking this in the wrong place.