The user's query ("bluray 720p 700mb fixed") likely refers to a specific digital rip or "fixed" release commonly found in online file-sharing communities. While the official Blu-ray edition contains approximately to maintain high-fidelity visuals and 1080p resolution, compressed versions (often around 700MB) are highly reduced for portability.
"The subtitles are out of sync." Solution: The "Fixed" internal subs are synced to the fixed audio. If you downloaded external subs, they are likely synced to the original buggy audio. Search for "The Forbidden Kingdom 2008 720p x264 FIXED subs." the forbidden kingdom 2008 bluray 720p 700mb fixed