Are you still wearing your FoTL mask? If yes, that's why. The FoTL masks only have light levels during the event, outside the event their light level is zero. This is why your light level has dropped. Take off the mask and put another helmet on.

All legendaries and exotics guns are gone from that warlock account. Including my ships and ghost and my light level dropped from 1579 1406 because all my stuff is missing for now reason.

[quote]All legendaries and exotics guns are gone from that warlock account.[/quote] Lost items cannot be recovered no matter what. Refer to [url=https://help.bungie.net/hc/en-us/articles/360048717732-Deleted-Item-and-Character-Policy]Destiny's Deleted Item and Character Policy[/url] for more information. Don't ask Bungie to recover lost items because they won't. [quote] my light level dropped from 1579 1406[/quote] I already explained that to you. You're still wearing the FoTL mask. The FoTL masks only have light levels during the event, outside the event their light level is zero. This is why your light level has dropped.