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No, that's the correct behaviour: a credit card doesn't take the money at the moment of purchase. A month's purchases are pooled into a statement and charged in one go the following month. The guide explains it in full under Credit cards.

It's the remaining credit limit: your spending limit minus what you've already spent in the current calendar month. It isn't a balance, and it's explained under Credit cards.

As a transfer: a prepaid card is an account of its own, because it holds money. See How money moves and Transfers.

They answer two different questions: the timeline follows cash, the summary works on an accrual basis. It isn't a miscalculation, and it's explained under The summary.

Edit that occurrence: the app asks whether to apply the change to that one only or from there onwards. See Recurring entries.

Under Settings → Language. You can pick one of the ten available languages, or "System language", which follows your iPhone's settings.

Under Settings → Data you can export everything to a JSON file, choosing the date range. The file is human-readable and stays yours: keep it wherever you like and import it back later.

Syncing goes through iCloud: check that both devices are signed in to the same iCloud account and that iCloud Drive is on. The first sync isn't instant — it can take a few minutes and needs an internet connection. If the problem persists, get in touch.

In Settings, by enabling the app lock. On launch you'll be asked for Face ID, Touch ID or your device passcode. If biometrics aren't available, iOS falls back to the passcode.

Erasing is permanent and propagates to iCloud and your other devices, so the app can't undo it. The only safety net is an export made beforehand — which is why it's worth exporting from time to time.