[Shotwell] sorting of photos

[bryan]

Hi,

Can anyone help me with this.
I am running 10.10 Maverick and Shotwell 8.1

Things have always worked fine and I love the program but have run into 
a bit of a snag.

I am sorting the photos by Exposure Date (ascending), but that is not 
how some of them are appearing.
Most are sorted correctly but some are appearing incorrectly at the end.
When I "adjust date", the date appears to be correct and also displays 
correctly.
I have re-loaded the program, deleted and rebuilt the database, have 
preferences set to write metadata to the files.

Does anyone else have this problem?