No this is not possible, you need a valid custodian grant address to submit liquidity. The liquidity is submitted by the server and corresponds to the average liquidity provided over the last minute for all users.
Liquidity shown by clients is rather unstable. These liquidity submissions never make it into the blockchain but only into the memory pool, which is not guaranteed to be synchronized between clients. This means that liquidity shown by clients is not just inaccurate but also can differ depending on the nodes you are connected to.
I guess this might even be the effect you see above, because earlier liquidity submissions may propagate slower than later ones and therefore appear at the same time at your client. If you check the liquidity frequently you will also sometimes see some of above addresses showing 0 liquidity although they clearly submitted something.
