Arabic Typography and Computing Solutions

im trying to add Contextual Alternate feature to an Arabic font on Microsoft VOLT.
The font is shipping without any errors. However, the shipped font applies the marks differently then what i defined. plus the characters shift position either upwards or downwards, each set of glyphs behave differently.
N.B: everything seems perfect when i use the proofing tool to check if what ive done is right on VOLT

What is the problem? and how can i fix it?

A private foundry and consulting firm, specializing in Arabic type and lettering designs, and related typographic software solutions. Founded by Arabic type designer Saad D. Abulhab in 2003, Arabetics is best known for producing open, innovative, and inspiring non-traditional Arabetic fonts. However, we have almost two decades of experience producing both traditional and non-traditional Arabetic fonts. Our passion to preserve the power, elegance, and competitiveness of Arabic and other derived scripts, within a dynamic and global computing environment, is our main driving force.

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