Keyword tags for imported iPhone photos disappeared from LR5.7 catalog under OS 10.10.1Yosemite.

Question

I am using LR 5.7 on a Mac OS 10.10.1 with a Time Machine backup - the vast majority of my photos were taken on an iPhone 5 in the year 2014 and are in a folder on my computer internal hard drive.
The structure is my Folders > Macintosh HD which has a folder inside called
Pictures Users/myname with 1719 photos in it -
when I click on this folder the following folders open up:
> folder dated 1904(?) with 2 items
> folder dated 2012 with 1 item
> folder dated 2013 with 1 item
> folder dated 2014 with 1352 items...
.... and so on until
>Exported Original Photos 365 (which are exports of photos from iPhoto that I wanted to catalog and develop in LR)
The Maths are correct. But as for the tags:
when I open the folder Pictures Users/myname containing 1719 photos and view them as thumbnails I see all the keywording applied to my collection of photos
BUT when I open the folder Pictures - Users/myname and then folder 2014, I see a list:
folder 2014 with 199 items
folder 2014-01-20 with 1 item
folder 2014-01-21 with 5 items
etc
All well and good.
BUT if I open these dated folders with small numbers of images in them (never more than 50 per day), view the images in a grid and click on a photo, there are no keyboard tags to be seen in the information panel. They only time I see any keyword tags that I have entered is when I open Macintosh HD > Pictures - Users/myname which contains my entire library of photos taken in 2014 and those added to the catalog from iPhoto.
Should I see tags for the photos in the individually dated folders e.g. Macintosh HD > Pictures - Users/myname > 2014 > 2014-01-20 and so on day by day ?
I have been tagging my photos with keywords after my weekly import. And have been doing this after viewing each photo from the grid view of photos displayed by clicking on  Macintosh HD >Pictures - Users/myname.
Have I made an error?
I want to tag my collection of photos by the correct method before it grows in size.
Many thanks
David (Brighton, UK)

Answer 1

Hi,
I moused down on the "+" sign where it says Folders and "show photos in subfolders" was shown as already being "on".
I followed your suggestion:  I tried to keyword the photo in Macintosh HD/Pictures - Users/myname/folder 2014-01-20 with 1 item however it did not permit me to type in a keyword in the keyboarding section panel on the left hand side, so I was unable to check if it stuck.
I don't know whether this is important or not, but the list of folders, subfolders etc have slightly different arrow heads:
If I drop down the Macintosh HD location there is a SOLID, grey downward pointing arrow to the left hand side of the folder Pictures - Users/myname/..
However, if you drop down folders from Macintosh HD > Pictures - Users/myname/.. to show inner folders:
Macintosh HD> Pictures - Users/myname/... > folders dated 2014-01-20 etc., then there is a horizontal triangle that is made up of grey dots rather than a solid triangle for every dated folder - is this as expected?