Those are likely related to people consuming the animal grade ivermectin, not the prescription based for humans.
More than 700 million people have taken ivermectin as an anti parasitic medicine. Something like 4B doses have been given. The WHO lists Ivermectin as an essential medicine.
"Essential" and "safe" doesn't mean it doesn't have side-effects. Both at the recommended dosing and above. Some people react to Ivermectin more than others.
That's why you should not be using it unless there is a clear benefit. For the 700 million people taking it as anti parasitic medicine it does have a clear benefit, but some of them still experience side effects, some of them even might have died.