it's strange staking in my wallet. I've got 3500 coins, but all time I see increasing days for staking. for example 3 days ago I had 4 days, but now I see 5 days for staking.. it's look like I never take my profit


it's a bug? or my mistake in wallet? what is wrong?

Your stake is against other people stake as network weight. Simply put, there are so many people staking so your odd is getting less each day, hence took longer.