Yeah, I believe that means Deepbot didn't catch the donation. Deepbot doesn't have direct access to your Paypal account so any donation made during this downtime wouldn't have been caught by your computer. When a user makes a donation Paypal and the donation page communicate with each other meaning when the user completes the donation information then gets sent back to donation page which then sends information to your Deepbot, causing the donation notification to happen.
I have a feeling in the future this could potentially be a thing even when Deepbot isn't running but don't quote me on that, I'm just speculating how it would be possible to save the donation log server side.
At this current time though, Sorry,
Dante557