Event Security log has very huge size

hi ;

I am facing a problem here with one site that the security logs for Folder auditing keep increasing very fast ,, in one day it become 50 GB!!

and after other day it's become 110 GB !

i did folder auditing for 20 site , all of them work fine except this one  , can you help with this ?

sorry for my language   .

Os : Server 2008 R2

it's shared folder with 4 T data (( we have bigger data and work normally , 2 G per day ))

i just activate audit object --> success from secpol.msc

and from folder just delete .