When the scanner says ID Searching, that means that it is set to hear all talkgroups on the system, even ones that you do not already have programmed. When it says ID Scan, it will only receive the talkgroups that you have programmed. You scan change it in the radio itself or in Sentinel.
I believe Dafe1er is correct in what he told you. The 436 memory structure is different than the 996XT's, and something is quite possibly not matching up during your cloning process.