What are 'adverse consequences' of merging two stock accounts?

So I'm hoping to consolidate two TD Ameritrade accounts, both solely owned by me, both just normal (non retirement, etc) stock accounts. I was about to click the final submission budget and TD Ameritrade advised me that they're not responsible for adverse consequences.

What adverse consequences am I missing? What is the potential downside?

*I hereby provide my legal signature and certify that the information supplied, the instructions provided, and the elections made are true and correct. TD Ameritrade Clearing, Inc. may justifiably rely upon the instructions and elections made and is authorized to deposit the funds or securities in the manner provided. I release and agree to indemnify and hold harmless TD Ameritrade, Inc. and TD Ameritrade Clearing from liability for any adverse consequences that may result from this transaction. I verify the instructions provided do not constitute a transfer for consideration (transfer of stock, funds, or any other assets for payment of goods or services). If the delivering account is a joint account or has multiple trustees, checking this box constitutes agreement by all account owners/trustees to the terms of this transfer agreement. *