I assume you're in Grid view. Make sure that you're sorting by Capture Time and not something else. Post a full-resolution screen shot of your entire LR screen showing the problem -- that would provide details for a helpful discussion.
I'm glad you asked me about the screen shots. I had them pasted into PS, and so I examined the Capture Time of each one so I could write a caption I noticed the images from my new 6d were 12 hours off as in EU time. I thought when I set it two days ago I had a choice, and picked 12 hour clock.
There went about 3 hours I could have used to edit this wedding shoot.
Well, I'm glad you got it sorted out. It's 2015, and our devices and software still don't make it all that easy to handle date/times without mistakes.