Could you please try to import the same images in a new Lightroom catalog.
Please do not apply any import settings while importing.
I've deleted and re-imported four times.
As far as I can tell, nothing is being applied while importing.
If I select all the files and edit the capture time to change to the file's creation date (which I've never had to do before) .. then the timestamp adjusts but the incorrect date does not. (the date is correct in Bridge).
I need to sync two cameras used at the same event.
I am able to manually edit both cameras so that the capture time becomes the creation date, but then they don't sync correctly.
I've done this many times without a problem, and I don't know what changed with the recent update.
The most efficient way to troubleshoot this is to upload a couple of the problem pics to Dropbox (or similar) and post the link here. Then we can see in detail what might be going on.
The import dialog window that you are showing, the right hand section, is only available if you select Add to the catalog not copy or move. So it seems your images are already on your hard drive. What program or method did you use to get the images from card or camera onto your drive? Look at that program/method as the thing that changed the Date and Time.
In the Library module expand the Metadata section and look at the "Date Time Original", "Date Time Digitized" and the "Date Time" fields. Do those fields show the correct Time and Date the images were Taken?????