Shiden SDN Dapp staking has been broken in Moonstake Wallet (I’m using Android) since approx Feb 3. Shiden made a recent change on Feb 2 that calls for a 5 day unbonding period when unstaking SDN. This might be the issue. Here is the forum update and my reply below discussing Moonstskes Dapp issue and screenshot.
I also sent a bug report to Moonstake through the app, please see that this fix is expedited as any funds staking before the issue are completely inaccessible!
Moonstake support request ([#7423]