If you used the barcode scanner of the Target app, i have encountered similar issues with it bringing up full price while the in-store scanner and checkout will give the correct price.
It may also be that brickseek was reporting the new markdown price as i think electronics price drops happen monday or tuesday, but may have changed.
But if they could not find any copies on the floor or in the back, then it won't matter much.
I have experienced items being nowhere to be found and then suddenly on an end cap a week or so later.
The whole GPS location determining pricing in the app definitely confuses things as you may get a different price showing up than you expect. Target.com will obviously always shows the online price while the app usually does if you are a certain distance from the store. In general, it should display the instore price when searching for an item while the barcode scanner seems to vary between online price, instore price, or potentially not being found at all.
The issue I had (and the other poster I think) was that it rang up $17.98 and then 2-3 days later reverted back to a $39.99 price.