The page is converting the GIFs wrongly, apparently it is not placing the layers / renders of the appropriate size, this makes the gifs not stable.
Previously I received a report about this in xat Help and thought that maybe it was a problem of the GIF I was using, but this is the second time it happens and I have tried it for myself.
* Step 2: Download automatically
* Step 3: Upload the converted image to an image host
* Step 4: Use the URL of the converted image