First determine the cause and the amount actually credited. Do not assume an additional transfer is necessary or sufficient without reconciling the records and project terms.
Separate a correction from a new charge
Confirm current official fees and the project’s actual administrative charges independently. This account supplies no live exchange rate or fixed bank-cost estimate; use the real transaction evidence rather than a guessed conversion. Take the steps in this order: establish the cause, confirm what the project’s documents require to be contributed, then decide whether anything further is owed and to whom.
Sending money first inverts that order and creates a payment with no agreed purpose, which is difficult to characterise later. Ask the project administrator to state in writing what has been credited and under which term of the agreement, and ask the bank to explain the deduction it applied. Those two answers usually close the question between them.
Where a further contribution genuinely is required, establish whether it must come from the same documented source as the original, since a top-up drawn from a different account can reopen a source-of-funds question that was otherwise settled. Confirm the current official fees and the project’s administrative charges independently of one another, since a single figure quoted by one party may fold in the other. Ask which of the amounts, if any, is refundable and on what condition.