my masternode worked for a couple hours and then it stopped getting masternode rewards after minting a 0.6 reward

i restarted bitcoin2d and it says "staking status": "Staking Active", on the console with "bitcoin2-cli getinfo" but appears as missing on masternodes tab with an error "could not allocate txin"

in coin control i have 1000 btc2 locked and 1000.6 unlocked but i only have 1000 coins. is this normal?

it worked fine for a couple hours, why did it stop working after getting the 0.6 reward?

thanks