It's normal. It happens when a giveaway you entered is deleted. The points are returned to you, making it so that you have your original 400 + the difference.
If you check your Entered Giveaways page, you'll see one or more marked as Deleted.
Comment has been collapsed.
5 Comments - Last post 29 minutes ago by kasiq
10 Comments - Last post 32 minutes ago by MagnificentOne
222 Comments - Last post 43 minutes ago by DeliberateTaco
2,364 Comments - Last post 2 hours ago by FranckCastle
172 Comments - Last post 3 hours ago by BSkorpion
16,655 Comments - Last post 3 hours ago by Golwar
8,636 Comments - Last post 3 hours ago by tommiwa
75 Comments - Last post 5 minutes ago by funnyduck99
12 Comments - Last post 15 minutes ago by 9389998
764 Comments - Last post 18 minutes ago by Wintermute101
151 Comments - Last post 19 minutes ago by Waciach
42 Comments - Last post 32 minutes ago by ShroudOfLethe
1,929 Comments - Last post 33 minutes ago by hebert2099
1,573 Comments - Last post 42 minutes ago by afa1425
Comment has been collapsed.