Photojpeg export suddenly 90% smaller files??
 

I've been exporting UHD clips as photojpeg and the file sizes are usually between 1 and 1,5 gigs.
Now for the first time in a month I'm doing the same thing but the file sizes seem to have been reduced by factor 10 ??!

I'm looking at the properties of an 8 second clip I exported a few months ago(1,2 GB):

3840 x 2160, Linear PCM, Photo-jpeg, Color Profile: HD (1-1-1), 2 audio channels.

And comparing them to the properties of a 17 second clip I just exported (247 MB) and they are exactly the same?!! (I've exported several files and they're all way smaller than prior exports.)

The only thing I can think of is that I did a software update and photo-jpeg has become 10 times as efficient ;-)

But seriously- what am I overseeing?