In boxing, if one of the semi-final losers is knocked out, he can't box
again for a certain time period as a safety precaution, and it
wouldn't be fair to take away his chance at a bronzemedal just
because his semi-final opponent was so much better than the others,in all other
cases the losing semifinalists both get a bronze in Olympics and other games because ,
there are no qualifying events before the main events .
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For the first time, Wrestling saw a knock-out system, which had a random draw for the first round. But in order to eliminate any anomaly resulting from two top contenders being pitted against each other in the very first round, a Repechage system was also introduced.
The knock-out system built up to the final.
The two bronze medalists come from the Repechage contests. All wrestlers who have been eliminated by the eventual finalists get a second chance to reach the bronze medal round by a series of Repechage matches.
The losing semi-finalists automatically go into the bronze medal matches and wrestle against the last two survivors of the Repechage.
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Because the IOC decides not to have a bronze medal match in that sport.
It is usual for people in combative sports to not have to fight again after losing therefore after losing a semi-final there is no fight-off for the bronze medal.
The likely reason that it appears as if there are more Bronze medals being awarded is that there was a tie for 3rd which would have 4 athletes on the podium; 1 Gold, 1 Silver, and 2 Bronze.
It is usual for people in combative sports to not have to fight again after losing therefore after losing a semi-final there is no fight-off for the bronze medal.