Would I still be receiving payments from shared masternode and from staking if I was on the wrong fork?
no staking rewards until u u resync ur chain
but ur shared masternode payments u get from miningfield will arrive and be visible once synced again
corret blocknumber is visible on chainz explorer
https://chainz.cryptoid.info/dmd/and on bittrex status page if u seek for DMD
https://bittrex.com/statusu can use the presynced chain uploaded by chris to fix ur chain fast