Using lasso tool and warping leaves empty pixels when filter is applied...

[APC]

I'm new to the forum so please be gentle...
So I make a selection with the lasso tool, free transform, warp and accept. everything looks fine and I go on editing. When I attempt to use a highpass filter or apply image it reveals what appears to be empty pixels at the edge of the selection. It doesn't happen when i use the Rectangular Marquee Tool. Not sure what to do...don't remember this ever happening before. :banghead:
Warps completed, looks fine

Using Highpass filter

Using apply image

 

[Crotale]

I try to stay away form the lasso tool, but when I absolutely have to use it, I add in a temporary red outer stroke (layer styles) afterwards to see it if my selection picked up any stray pixels. I can turn it off after removing any strays.