Protein powder keeps welding itself to the tub bottom

I split a 5-lb bag of unflavored protein into two quart jars three weeks ago. The small jar is fine; the big one has developed a crust that bends my scoop. I’m on a GLP-1, so shakes are a reliable lunch when solid food sounds like a lot, and I hate tossing the last third of a bag. I’ve tried a dry fork, a butter knife, and leaving the lid off for an hour—none of it convincing. Before I buy more jars or humidity packs, I want to know what has actually held up for you over a month, not just a clever hack. Is this a moisture problem, a static problem, or am I just storing it wrong? And does decanting really help, or is a smaller package the only honest fix?