[iOS] GBiT changing transaction date, original one still available on email receipt

I recently changed my smartphone from Android to iOS and noticed that when I GBiT with a transaction the date shown in the app (both in Wallet - Payments and in My Money - Timeline) is changed to the date of the GBiT. The original date is still available if I ask for an email receipt.

For what I can remember, no date change in the Android app.

Any idea?