ContextualAlternates (calt) is not working in the font file.
Please use the link given below to download the font:
https://we.tl/t-10kHEQzx3E
Use the given words for calt testing:
لنسبت
مبغضین
attached image showing correct view of words if calt is working.
That specific font file contains a VOLT source table, which conflicts with the actual OpenType layout features.
To overcome this problem, we will release an update which ignore the specific VOLT data.
This update should solve the issue:
https://www.high-logic.com/tmp/fontcreator/FontCreatorSetup15.0.0.2997-x64.exe
Let us know your results.
Thanks for your prompt assistance! The software is working like a charm now, and your quick support was key to making that happen.