Hi, yesterday I've bought 1.1 Ethereum after a long time of research for the best place to buy Ether and the best to stack it. I've used BTCdirect because some of my friends already used it. At BTCdirect they recommended to use Coinomi as a wallet, so after some more research I downloaded Coinomi and first I bought 0.1 Ether and when it arrived in my wallet I bought 1 Ether more. Happy that it worked and that my Ethers were finally in my wallets. One hour later my coins disappeared and were send to an unknown adress. I only wrote my safety phrase on paper and nowhere online. I didn't download any apps after I downloaded Coinomi. In the link you can see the transaction. I thought Coinomi was a safe app to use.... Can anyone help me with this problem?

https://etherscan.io/address/0xb001aaaecc56ca759053a9ca644e0bc5b92c97dd

The steps I took within Coinomi were that I first created a fast wallet en than clicked on making a backup where they gave me my recovery phrase, after that they asked to put the 24 words in the right order and that was it. What has gone wrong?