Usually because it isn't just being responsible for yourself, other people's responsibilities get added in too, usually a partner or husband who is more than capable of organising themselves but it somehow lets it fall to the woman. You know you didn't empty the packet of coffee beans but if the person who did doesn't put it on the shopping list or buy more coffee beans then this becomes your responsibility too whilst they head out the door to their "hobby".
Add in children and they clearly cannot be responsible for themselves, so you go from being responsible for remembering everything for one person to 4 people.
I have a hands on husband who would repack the nappy bag if we had been out the house and used items, restocked the children's spare clothes into the car for those inevitable food slops or falling over in mud. He was an equal. His Dad retired at 53, his Mum carried on working full time, she was still expected to meal plan, cook 5 meals a week and do the supermarket shopping despite having a husband who held down a job that required thinking skills. He was more than capable but refused to do it.
The jobs I had would never have spilled over into home life, we had a clear desk policy so even the cleaners couldn't see the work, it was locked away on the premises and certainly not allowed to be brought home. I also worked before email became a thing. You went home, your work was done. A lot of people have jobs that spill over into evenings meaning there is no switch off from work. They are just expected to keep checking their phones. It all adds up.
Do you have children?