Just a thought. Are you downloading current weather all the time or only some of the time?
I download on every flight and go with that but if you are reverting back to a default flight or a previous flight where your weather is set regardless of what you have applied in Settings then you'll get that weather.

Before you try again take yourself step by step through your set-up and see if you apply the same steps every time. It could just be a variation in your routine.

Good luck