hi miniblox developers i had an very critical issue that is xp which is for levels

I am having a serious problem that is xp which is for levels when i want play in kit pvp or classic pvp when i get a certain kill it is giving xp ok. But it giving xp not xp multiplier like it will double the xp to twice of normal like x2 but the main problem is iam not getting that multiply of xp for level up. I literally want this bug to be fixed . And the bug is sometimes not all the time but straight 2 to 3 days it is so i request you to fix this. And thank you