Ratios change after "edit all articles"

[twothreenine]

I used the "edit all articles" menu for "Farmer John" twice and it worked (unlike in #79) but I noticed that articles with more than one ratio changed:
Beer: from 20.0 Bottle, 0.5 litre to 20.0 Bottle, 200.0 litre (note: 0.5 * 20 = 10; 10 * 20 = 200)
Detergent: from 20.0 litre, 1.25 kilogram to 20.0 litre, 500.0 kilogram (note: 1.25 * 20 = 25; 25 * 20 = 500)