Again thank you for responding so quickly and so in depth.
The first one:
https://blockchain.info/tx/8daa04de0ecea39626c1582d5f17c2ba344af4434915614a9fae387d55cad5ae
has 12 confirmations
The second one:
https://blockchain.info/tx/7982a63e899738f1aa3c458901ac0c0aef2c398814887933df707c5adc04dfd3
81 confirmations
The thirth one:
https://blockchain.info/tx/fe63e9674c46abc7cb303e247b86ab15921218ec3a0cd9e2ff45f471fd85da40
347 confirmations
To be honest, the first one not showing up might be due to a lagging server, but the other two should actually show up at the receiver's side...
What you could try is to save your current wallet, then go to electrum => file => New/restore => pick a temp name => standard wallet => i already have a seed => enter your seed => restore
Make sure you're running an up-to-date version of electrum (currently 2.7.18) and that you're connected to an up-to-date server (green button in the right bottom corner)