Yoroi Shelley Testnet would not show the correct balance after resync with the blockchain from my Daedalus mainnet. I have attempted multiple times to resync and to restore the wallet but do not show the correct amount.
The incentivised testnet started using a snapshot of funds on mainnet as if 29th November 2019. So it is normal that it wouldnt show the same balance as Daedalus Mainnet.
Please check this link for further background about incentivised testnet.