I had 3 eyes (or keyholes) in a one of my normals and one het albino.
I have had a normal with 3 eyes:-
And a het Albino with 3 eyes:-
That’s 2 out of the 4 no morph snakes I have had with 3 eyes, so I guess it just happens sometimes.
I have even see 4 keyholes/eyes here -
Its the first link