You've gone ahead and created a BCH address with MyBlockX but it looks different than your usual BTC address. No worries, you're not missing anything here.
When Bitcoin Cash (BCH) was originally created, it had a similar address format as bitcoin. Attempting to bypass any confusion for users who had both currencies, BCH developers later suggested a new format for BCH addresses called CashAddr. This new format helps users distinguish between BTC and BCH addresses. The updated format only changes how BCH addresses are displayed, not the underlying private and public keys.
Bitcoin Cash addresses may also include the SRN identifier (System Resource Name) prefixing the address. So it is still a valid address and will work just fine for depositing funds. BCH addresses in the Blockchain wallet now look like this (Note: this is just an example address. Do not send funds to this address): qp3wjpa3tjlj042z2wv7hahsldgwhwy0rq9sywjpyy.
They can also have a prefix (bitcoincash:qp3wjpa3tjlj042z2wv7hahsldgwhwy0rq9sywjpyy).
The Address Isn't Accepted For My Deposit?
If the wallet or exchange you are depositing to doesn’t accept the address, simply delete the SRN identifier (ie. 'bitcoincash:') and it should be accepted.