On July 13, PIA flight PK536 to Sukkur left Karachi at 6:26 PM.

Source: karachiairport.com.pk
Malfunction in aircraft navigation system was given as the reason by cockpit crew for aircraft's deviation from flight path, claim news reports.
https://arynews.tv/pia-flight-from-kara ... -off-path/
The aircraft was able to safely complete Karachi to Sukkur flight PK536. Later, it safely performed Sukkur to Karachi flight PK537.
July 13, PIA ATR 42-500 (aircraft registration AP-BHI) Karachi to Sukkur flight PK536 flight path.

Source: flightradar24.com
For comparison:
July 8, PIA ATR 42-500 (aircraft registration AP-BHI) Karachi to Sukkur flight PK536 flight path.

Source: flightradar24.com
Abbas