Most flashes won't even fire unless they are at roughly 80% of full recharge level. If the "ready" light comes on you should be OK, unless you are pushing the range limit of the flash. Asking again, what flash are you using?
The OP should post one of the affected images with the EXIF intact so we can better see what he is doing.
i clear the settings from the menu but nothing change also i noticed the time didn't change
so that it means that the clear setting doesn't work probably
That isn't necessarily true. A reset on most Canon models retains the date/time but clears such things as Custom settings, etc.