Hey there!
Just FYI, in all Adobe apps 'redo' is NOT ctrl+Y, it's 'ctrl+shift+z'. That means, by default if you assign some button to 'redo', it actually would do ctrl+Y, which, for example, in After Effects is a default for "Create New Solid". Of course, there's a workaround is to assign a custom keyboard shortcut "ctrl+shift+z" to a button you want, but it's a bit confusing and takes time to investigate :)
Val