That happened to me, as well.
Items placed on the GTN after 1.5 and sold had a much-reduced deposit (as stated in the patch notes) but then a chunk was taken out of the sales price when the sales email arrived.
An item placed on the GTN before 1.5 and sold afterward *seemed* to arrive with less funds than the sales price, but I am not really sure as the one I noticed that did this did not actually list the price (one of those 'someone has purchased something' emails where the player and price are nowhere to be found). I don't list that many things, however, so I'm pretty sure the item that did sell should have netted a higher sales credit amount than what arrived.
While the lower deposit was in the patch notes, the large chunk taken out of the sale was not noted, so I do not know if it is intended.
Alright, so I hope the devs see this, and fix it if it is not what they want for the GTN. Personally, I feel its taking out a big cut, and should not be taking out a huge cut from our profits... edit : which in some cases are from buying mats, and items from the GTN which means selling for 5 k profit for a reasonable item that takes time will mean there is less profit and it takes the same amount of time. I think this will impact crafting very negatively especially for items with a low profit margin. Maybe if the market 'adjusts' but the last I checked the raw mats to make items are just as expensive.