Great, at least my question seems less ridiculous after all and it may even be useful to others! Indeed this problem occurs on Trustwallet and I had never seen this before.
I strongly recommend you to avoid using Trust wallet. If you'll search the forum for users complaining about Trust wallet you'll find many such posts.
This topic is and example and hosseinimr93 explains it very well:
The seed phrase (also called mnemonic) generated by trustwallet is BIP39 and can be imported into many other wallets as well. Of course, this doesn't mean trustwallet is secure. Trustwallet is close source and we don't know whether they have access to users keys or not. It's also possible that you can't recover some of your altcoins due to not knowing the derivation path used by trustwallet.
The best is to avoid any close source wallet like trustwallet.
Charles-Tim, another experienced bitcoiner, explains same thing
here:
Know that Trustwallet is close source, this is the reason I can not recommend it, but can be good for altcoins in a way no option for open source wallets, but the wallet is not recommended for being close source.
If you want an easy to use mobile wallet, try
Bitcoin Wallet for Android. This may be the easiest to use wallet. It is listed as recommended on
bitcoin.org and it's pretty secured. You can also try other wallets recommended on bitcoin.org.
But under no circumstance use a closed source wallet!
I hope this helps
