Disenchanting Champs is not adding up the BE

I had 146K BE... I made lvl 40 received another level up item to my loot and unlock it and get 3 champs, then I disenchanted 3 champs, Ashe, Vel'Koz and something else (I already own all champs)

The vel, was 1260 BE for disenchant Ashe 90 the other champ something like 300 BE

I still only have 146 BE.

What is this... ? Riot, do you not know basic math?

This is not the first time I have noticed this, as many times already I had sold enough champs back for BE and should have moved the BE total to the next thousand but not,

by my accounts, if I had 146K BE, add 1260 + 90 + 300 then I should have at least 147K showing on the 3 digits you use to indicate balance of BE.

What is this nonsense riot? Are you just taking advantage?