Non-co-planar Transparent textures overlapping

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Here I posted detailed image of the situation
these textures are not in a same plane as you can see
arrows are far enough behind the bird but they appear to be in front of it in some angles

note that it’s the scene view(not camera) and the story is the same in the game mode too…
any one knows why it happens?
thanks

Use an orthographic camera, and make sure that the objects are drawn on planes that are as far apart as you can make them. Fake any perspective effects.

If you have to use a perspective camera, then make the near and far clip planes as close as possible.