In Ep.5 when Bray spots Pride wearing Amber's ring, the whole scenario
of her death comes into question. Dal decides to settle the issue
once for all and heads for Eagle Mountain without telling the others.
They of course guess and follow. As we know, Amber's grave is empty,
and Pride's story gains credibility.
Now look at the rocks on the graves,
comparing S2 with S3. To my eye they've got bigger, and the graves
are higher and less spread out. I would expect the opposite to happen
with time. And whereas Amber's cross looks about the same, the upright
in Zandra's has changed shape.
Pride reluctantly takes Bray, Ebony and Dal back to his tribe where
they find Amber very much alive, though now calling herself Eagle.
When Bray busts into her treehouse demanding answers, she tells her
story, how she found her own grave that day on Eagle Mountain shortly
after the Mallrats had left. The flashback shows the two graves, and
it is the new S3 version that we see, even though it is depicting
what happened in S2.