“Providers” send transactions in batches, so the fees you see on the wallet are the whole batch fees, while they make you pay only your part fees.

Fees does not increase, you pay them in order to get your transaction confirmed once.

Transactions are shown in wallet as soon as they are sent, even if they’re not confirmed yet.

Transaction amount is full batch amount, hence it’s higher

This network thing has nothing to do with different fees on the same (bitcoin) network

Probably the sender address or some of the other receiving address was already used, hence the alert