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GUI translation site triggers Persian checker in Arabic translation

While translating GUI into Arabic (on webtranslateit), I noticed that the (seemingly) Persian checker is triggered in the following case:

When adding Kasra diacritic together with Shadda diacritic, as in the word:

فقط إذا حُمِّل مستند منفرد
If only one diacritic is used, the Persian checker is not triggered.
I suppose that the LT triggers the checkers of the language chosen (Arabic), right? If so, then checkers of other languages shouldn’t be triggered.