Daylight savings glitch?

No

Bro commsnted before image was made

That isn't even possible so no

No matter how many hours old the image is, if it is posted in the same 24 hour timespan that it was made, it will show this.

Submission time and creation time run differently, which is shown in the moderation logs of any image (if you have mod in that specific stream.)

You can comment on an unsubmitted image.