This problem was discovered through a customer support issue. We had one user who deposited BTC to Hive Engine as shown here:

However, this deposit address is actually a Steem Engine deposit address, as shown in the Steem Engine CTC admin page:

So the user ended up with BTCP instead of SWAP.BTC.
Please make sure Hive Engine is communicated with the correct CTC API endpoints. For Steem Engine the endpoint is https://converter-api.steem-engine.com/api/
For Hive Engine the endpoint is https://converter-api.hive-engine.com/api/
This problem was discovered through a customer support issue. We had one user who deposited BTC to Hive Engine as shown here:
However, this deposit address is actually a Steem Engine deposit address, as shown in the Steem Engine CTC admin page:
So the user ended up with BTCP instead of SWAP.BTC.
Please make sure Hive Engine is communicated with the correct CTC API endpoints. For Steem Engine the endpoint is https://converter-api.steem-engine.com/api/
For Hive Engine the endpoint is https://converter-api.hive-engine.com/api/