Re: Stupid reloading moments...
Take the time to read the instructions on the can. Not being facetious here, but several types of spray lube require the cases to be left to sit a bit before resizing. They use alcohol or other solvents as carriers for the lube, and need to evaporate before the lube can do it's job. Using them too early, or without the required evaporation time causes them to behave exactly as you've described. But, as I said, read the label. Not all of them work like this, and some can be used immediately.
Hope that helps.