My silver is gone. I had around 16,000. I logged out, logged back in and had 2000. I then sold a Symurgh named Pond for 11000, and now my exact balance is 13,889. I am positive I didn't buy anything because I'm saving for blueprints. 

Here's the list of expenses, please make sure that none of them is taking your silver away:

• Daily pet food (18 per pet if you don't have enough food in your inventory)
• Genetics research (100 per gene)
• Hiring catchers and sending them to expeditions
• Placing bids on pet and item auctions
• Buying pets and items through private offers
• Accepting a breeding offer from another player's pet
• Losing a battle with bid on Arena or in private challenge
• Buying items from the Magic Shop on islands
• Using Forest Alchemist, Dead Tree Altar, Copper Idols and Shaman Hut on islands
• Training a pet. Please remember that silver is not refunded when you cancel the training session.
• Crafting items and constructing buildings
• Using custom skins with silver fee

I have the same glitch but it happend evry time i open my starters page.

I lost 1,000 and I just logged out 1 second ago by mistake.

I once had 20,000 more silver, and I bet it all on a unicorn. I ended up losing the bid, but it still took my money!!! So aggervating to me! I could've had 50,000 silver right now!