I'm having the same issue with the discount not showing up.
3 shirts in cart @ $88 each or 3 for $219 and the final total is showing as:
SHIPPING & HANDLING: $14.95
SALES TAX: $1.33
Even if I was paying full price for the shirts, it's not a 25% discount. The Irish Linen shirt I wanted which was showing at $49.25 is also showing at $98.50 instead of the sale price.
I'm also getting the discount box Hard2Fit mentioned.
They jack prices up or remove sale prices during F&F, best bet is in store...