I realized that blockchain.info wallets are creating huge transaction sizes due to splitting one transaction and then merge it into one 
It's causing expensive transaction fees!

why is that so and how can I prevent this stupid "feature"?
Is there any setting on the blockchain.info wallet?

example tx: https://blockchain.info/de/tx/1defc8711cfc0492f0bc84a56cf4c9e747fe785a6d23d1d4b914448086e0e034

I just had to use btc.com tx accelerator and gave those chinese 11 dollars...