It's been a couple days since you posted, did you figure this out? The only thing I can think of is that maybe you have the settings to stop at the last puzzle you tried and you are hitting the "try again" button. Does that sound like what you are doing?
tactics trainer
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The last three or four times I've done the Tactics Trainer, I get the same three problems. I think I've got them figured out by now. I'm on the unpaid version of chess.com. What do I do to fix this problem?
Bill