What happened to MUT coins?

I started the game after a two day break, and my Mut coins was gone. When I left two days ago, I had 600,000 coins, I cut the game back on today and I’m left with 26,000 coins. What happened to my coins because I didn’t get any type of notification to say this is what happened or maybe there’s a glitch I don’t know can you please get back to me? Thank you.