CloudWatch automatically encrypts data

I have some Lambda functions running on AWS that send data to CloudWatch. Previously, I was able to view the logs in plain text without any issues. However, recently I've noticed that while the logs are still being generated and briefly displayed in a readable format, after a few seconds they become encrypted or otherwise unreadable.

I'd like to know if any default configuration may have been enabled recently, or if there's a policy or setting that could be causing this behavior. Is there a way to make the logs readable in plain text again? It's worth mentioning that I have administrator access to the account.