You should not have received overtime shot penalties, and they are not procedurals. Know the rules.
9.4.6.2
Where static scoring paper targets are used, a shot (or shots) fired more than 0.30 seconds over the set time, will be considered overtime. For example, if the time is 5.00 seconds, a shot(or shots) at 5.31 seconds or more would be considered overtime. Overtime shots will be penalized the maximum possible scoring value of each shot so fired. If the overtime shot results in extra hits on the target, only the specified number of shots may be scored.