Up facing Float & Swim sprites simply flip if using original for the animation style. :s
Original Link Animation for Water
It does the same thing for walking and charging as well. So, yeah... the animation previews are a bit deceiving. If you want to fix this problem, try using BS Animation instead.
But honestly, it's not just the Z1 animation previews that are messed up; the Z3 animation previews and the 2x2 Link animation previews are a little glitchy for some reason.
[MENTION=42714]Gleeok[/MENTION] [MENTION=38582]Saffith[/MENTION]
I agree with XMuppetSB the best way to handle this would be to fix the animation previews. We can deal with adding a 2-frame walking animation later.