You see that rune that looks kind of like a bow? That was not used by vikings. Same for the one that looks a bit like a capital M. They ARE runes, they just were not used in Scandinavia at the time vikings were active. Also that picture from 1928 (I think the year was) where some people are sitting on the stone? The runes look weird and I’d be surprised if the picture hasn’t been retouched.