This is expected behavior for RocketBolt.
The email protocol, which was originally developed in 1982, does not have a publicly-accessible, built-in mechanism for tracking when an email is opened. As a result, any company that tracks email opens -- whether it's RocketBolt or your email marketing tool -- has to use a technology called "pixel tracking."
With this approach to email tracking, it's impossible for any company to accurately tell who opened an email. This is especially true if an email has more than one recipient.
No email platform can tell for sure when you open your own email with 100% accuracy. It's technologically impossible. While some companies will try to guess, this often results in missing when emails were opened by recipients.
In contrast, the majority of our users prefer to see notifications whenever their emails are opened since they're able to quickly and easily identify whether or not they opened their own emails.