Check the Armory transaction details of the one does not exist on Electrum and look for the address if it's the same as what you import from Electrum wallet.
It could be a different address? If that's the case it won't show in your Electrum. So you will need to take the private key from Armory and import it to Electrum if you want to add the transaction history of this address.
Well I did exported my private keys as base58. Don't know if there is anything more to get out of it, perhaps I should check in the armory forum. Or if it was something that went wrong when I imported the keys into electrum.
In electrum I can only see the first one and the size is the outputs not the amount in btc that I did send, is it possible to change that as well?
What do you mean by the bolded part? Can you please send a screenshot if you don't mind?
I'll try explain again, and this is what I think about the problem, I'm not sure.
Eg I will send 1 btc to bob and let say that I don't have any address with the correct amount of btc. Because I only received 0.5 btc and 3 btc. So to send 1 btc I need to send 3 btc + 0.5 btc (don't know why the 3 btc transaction is enough). So my output will be 3.5 btc and my exchange will be 2,5 btc.
The transaction amount in armory is 1 btc, but in electrum it is 3.5 btc.