We put sale items live in batches. This means that your items may currently be showing at full price even though you agreed to put them on sale. The sale prices will show once that batch is made live.
We do this to increase the probability that your item sells. It is less likely that your item gets noticed and sells if it is buried somewhere in a huge number of sale items. So we push items out in smaller batches and market each batch to our customers.
If you confirmed your sale pricing but are not seeing your items on sale, don't worry. They will definitely go live in one of the future batches.