Ir's been noted that some GIFs don't animate in Videopad. If the GIF appears under the Video bin, it will animate; if under the Images bin, it will not.
Share that GIF and others will check it out...
Upload the file/s to a free server, such as Google Drive or MS OneDrive, get a shared (public) link, copy the link and paste it here or to me in a Private Message via the mail envelope in the top-right corner of this forum. When using Google Drive, if necessary change "restricted" to "anyone with link can view."