you mean your Steem Power? Look at the bottom of your wallet page, just before your transactions. It says: Estimated Account Value: The estimated value is based on a 7 day average value of Steem in US Dollars.
Steem has been going down, so your Steem Power will also go down. I will go back up when the price of Steem recovers.
RE: why does the amount of bitshares in my wallet keep going down everyday?? can someone answer this please??