not so weird, the system wants to get paid for services provided.
if the amount you are sending is large the system wants a min amount (IDK what that is) to send it, 2 DGB if farrrr more than enough.
I'm quite used to paying a transaction fee, and the wallet automatically determines the fee. The thing I find strange is that I get a "transaction too large.." one minute, and then a few minutes later the same size transaction is not too large any more. Also there's a large discrepancy in the transaction fee that was automatically levied. The second transaction, which was for 14% more than the first, had a 500% greater transaction fee!