Breaker clips - broken
You have 30 space seaimens panel and this load centre will not take twinner or tandam breakers so just keep it in your mind on this one.
Now the issue you have there is that someone install wrong breakers and damage the plastic clip rail if that so the only way you can do is either add subpanel to move the circuits from damaged clips or replace the panel so there is two ways to do that but I will check the seaimens to see if they have replacement guts for it.
I am not too sure on that seriés but I can able verify it.
But if possible to post the photo that will help us to indentify more clear on it.
The answer will be based on NEC ( National Electrical code ) or CEC ( Cananda Electrical code ) or ECF ( Electrique Code France )