Bounced, yet apparently opened

I have just sent out my first newsletter using your plugin.

As usual, I work through the list of bounces and remove the subscriber from my list.

I then noticed that one of the so-called ‘bounces’ had, in fact, been opened.

Does this mean that I cannot trust the ‘bounce’ statistics – I certainly do not want to delete valid subscribers.

https://www.ads-software.com/plugins/wysija-newsletters/