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My SAT 3D Algorithm

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I made a SAT 3D Algorithm for two thetraedron, which works like this:

[font=comic sans ms,cursive][font=courier new,courier,monospace]i made this for each polyhedron.

I made the face normals with the cross product of two edges, like this:
for each face, to get the normal.
then i searched the biggest and smallest Projection value.
then I compered them for overlap.[/font][/font]

[font=arial,helvetica,sans-serif]the Problem is:[/font]

[font=arial,helvetica,sans-serif]If theres a collision, it alwys returns true, but it also returns true if theres no collision sometimes.[/font]

[font=arial,helvetica,sans-serif]Did i forget something?[/font]

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