LinuxQuestions.org - Using convert makes weird animated image

I made an animated image but parts of the images leak over to the other image. Like one image displays itself and what was left over from the image before it. Im wondering if there is a way for convert to make an image that displays each image at a time so that there wont be left over pixels when displaying the animated image.

Heres the command Im using:

Code:

convert -delay 50 beholder_dread.331.png -delay 50 beholder_dread.351.png dragon_clsc.gif

Parts of beholder_dread.351.png always show when displaying the animation. I want it to display each image at a time is it possible?