Contact Support and reference this article. 

Alternative Solution:

This error is generally linked to American Express credit card accounts.

Although the amount is specified in the Merchant Account transaction, AMEX are using the 'Doing Business As' (DBA) name rather than the Statement Descriptor, which can be configured within the Blackbaud Merchant Services portal to display the organisation's name.

The DBA name used by Blackbaud Europe customers for BBMS is BLKB-Glasgow

Would recommend informing donors of this DBA name when they commit credit card payments to make them aware of the name used when payments are processed. 
Would also recommend donor contact American Express to confirm the payment is not suspect.