What do I need to do to fix this issue. My Dell laptop will not remember it's Bitlocker Pin and I must always use the 48 digit

First make sure that you do not have any bootable external media attached when starting up (Thumbdrive, SD card, Floppy disk, etc.).

Before using the nuclear option of decrypt/reencrypt. First try suspending BitLocker, rebooting, then resume BitLocker. If that doesn't work, then reset your PIN (https://help.bridgewater.edu/index.php?/Knowledgebase/Article/View/145/19/changing-the-bitlocker-pin). If those fail only then do you turn BitLocker Off/On. If this is a corporate laptop your IT department must do this.