Clown
Assuming you're a pilot, the allowance will vary depending on the level of education your children are receiving. Secondary school, for example, has the first 36,250AED paid at 100% by the Company. 90% of the remaining fees are then paid by EK up to a maximum of 72,500AED. Any amount over the maximum is paid in full by yourself. These figures are for 2015/16 and effective from 1st September. It's also pro rata so if you've not done a full year here, your allowance will reflect that.
Whilst it's often helpful to get a few pointers on these forums, why not question the discrepancy with the relevant department? Copy in HR as well so there is visibility in the process. They don't often make mistakes to be fair, but in this case it's definitely worth following up.
Harry