Some of your goods could not be placed for sale: QUANTITY_MORE_THAN_CAN_SELL

I didn't place more of those goods on the market than I am allowed to and the order was successfully placed as I input. Nothing else was input for sale.

possibly someone hit you or stole from you while you were placing on the market.

Nice thought but that didn't happen.

did you try to sell a period instead of a digit :P

No. As noted the transaction actually posted as intended.