About Resize image

After I try to use image resize fucntion in my forum together with forum widgets.

When I post the large image like this
http://ploiiscan.thai-forum.net/t546-topic

If I click "Click to see fullsize" ,the image that show in forum isn't full view.
it about half and cut off fit with the size of forum width body. like this
http://ploiiscan.thai-forum.net/viewimage.forum?u=http%3A%2F%2Fimg607.imageshack.us%2Fimg607%2F6831%2F014ff.jpg

but if I doesn't use forum widgets, The image will show all of full view normaly when i click to see fullsize.
Why this happen? help me please

Everything is working fine.

https://2img.net/r/ihimizer/img607/6831/014ff.jpg

THIS IS IMAGE FULL SIZE OF THAT PIC

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http://ploiiscan.thai-forum.net/viewimage.forum?u=http%3A%2F%2Fimg607.imageshack.us%2Fimg607%2F6831%2F014ff.jpg

but this page doesn't show to see all of that picture
( the rigth side of the picture is unseen ) there doesn't have scroll tab from left to right in browser

I don't see a problem with it. If you happen to mess with your sizes on the image resizer you would make it smaller in the post.

Ok ,thanks you for suggest.
but if this case can't fix. I'll try to be back - unuse forum widgets, So full size of images are show normaly now.