KFGQPC Uthmanic Script Hafs - Diacritical marks are not displayed properly

I'm using the KFGQPC Uthmanic Script HAFS - Font because it is the best looking font out there for my app. The only problem is, some characters are not displayed properly.

For example have a look at this:

The text, that should be displayed, looks like this:

أُو۟لَـٰٓئِكَ عَلَىٰ هُدًى مِّن رَّبِّهِمْ ۖ وَأُو۟لَـٰٓئِكَ هُمُ ٱلْمُفْلِحُونَ

Notice that circle (sukun) above the first و۟

If you ask which text I use to display the arabic text, its the following (in unicode):

\u0623\u064f\u0648\u06df\u0644\u064e\u0670\u0653\u0626\u0650\u0643\u064e \u0639\u064e\u0644\u064e\u0649\u0670 \u0647\u064f\u062f\u064b\u06ed\u0649 \u0645\u0651\u0650\u0646 \u0631\u0651\u064e\u0628\u0651\u0650\u0647\u0650\u0645\u0652 \u06d6 \u0648\u064e\u0623\u064f\u0648\u06df\u0644\u064e\u0670\u0653\u0626\u0650\u0643\u064e \u0647\u064f\u0645\u064f \u0671\u0644\u0652\u0645\u064f\u0641\u0652\u0644\u0650\u062d\u064f\u0648\u0646\u064e

Any suggestions?

Replace all instances of \u{06DF} ◌۟ with \u{0652} ◌ْ The original text you are using uses the Arabic Upper Zero characher instead of the Arabic Sukun character. That's why this issue occurs.