If I stall on 1 exercise, do I also deload on other exercises to keep exercises equal?
No, don’t hold back. Only deload on the exercise you stall. Keep adding weight on other exercises. Don’t worry about strength balance between exercise: StrongLifts 5×5 takes care of it. You’ll stall first on the Overhead Press, then on the Bench Press, then on the Squat and then on Deadlifts. Stalling on Overhead Press happens fast, it can happen during your 1st month.