The VAT and ex-VAT prices have always displayed higher for me.
I had assumed that it was a small surcharge to go towards postage costs or whatever, or else that IRM work backwards from the Irish VAT price for customers abroad.
For example, for Germany, they take 19% (German MwST) off the Irish VAT price, and then add 23% on, instead of the other way around.
For me, they take 21% (Spanish IVA) off the Irish VAT price, and either add 23%, or don't add anything on.
€73,86 is also the ex-VAT price for me, so I dunno. Again, it's always been this way, and I kind of assumed that it was just the way it had to be.