Arabic may use a past-tense form after «إذا» while the conditional construction concerns an anticipated event. The form can present the event as readily envisaged or as though realized.
«فَإِذَا جَاءَتْهُمُ الْحَسَنَةُ قَالُوا لَنَا هَذِهِ وَإِنْ تُصِبْهُمْ سَيِّئَةٌ يَطَّيَّرُوا بِمُوسَى وَمَنْ مَعَهُ»
When good came to them, they said it was their due; if misfortune struck them, they blamed Moses and those with him. (Qurʾān 7:131)
The contrast «إذا جاءت» versus «إن تصبهم» is central. The first depicts good arriving as a recognizable situation; the second leaves the adversity within an «إن»-condition.
Interpretation depends on the particles, the forms, and the discourse together—not tense alone.