Attached files have zero size in attachments table

XWiki 14.10.13

Just noticed that all the attachments have a size of zero bytes, but they don’t when downloaded and they work correctly:


This happens on other pages too.
What should I check?

Hmmm… just reopened that page today and they all now have the size:


the only thing I did is update the txt file, as you can see it bears a 1.2 version.