Welcome to TVPaint Community forums !

I got into a situation here and am not sure how to correct it : I tried to cut out a portion of a drawing and flip it, but instead it affected all of the instances and flipped them as well.
I then highlighted all of the drawings in the sequence and went to Image - Modify - Flip Horizontally, thinking this would get me back to normal. But now all of my drawings in the project window are flipped the incorrect direction until I play the clip, then they're facing the right way.
Anyone have an idea how I can undo this?

I think the reason is the following.
・Difference between view flip and image flip

You solved it!
I flipped everything again using "Image", which didn't solve it, but then I flipped it again using "View", and then yet again using "Image" and now it's back to normal.
Thanks Hironari!