That wording is very confusing and I have not come across it before.
The tax you pay is, normally, completely separate from any donations you made to charity. So if you are due a refund of €524, then you should get that, whether you made donations to charity or not.
However, the amount claimed by the charity cannot be more than the tax you paid.
Let's say you €10,000 donations in a year. The charity can claim an additional 45% or €4,500.
If you have paid €8,000 tax, then they get the full €4,500
If you have paid only €2,000 in tax, the charities will get only €2,000.
I wonder in your case have the charities claimed €548.
Say you had originally a tax liability of €600 , so the €548 was paid out.
Now you are due a refund of €524, which would bring your liability down to €76.
But they paid out €548 so they must reclaim that from you?
Brendan