Putting in diva cup

This isn't the first time I've used it. I've had it for a long ass time now and sometimes it works fine, other times not so much. I have a pretty heavy flow and use my cup on the lighter days. But even when I'm sure it's popped open and pretty sure it's in correctly it seems to move/leak pretty often. Also Whenever I take it out the stem leans to the left side pretty far and idk if it's just adjusting itself to my body or maybe it's not supposed to lean like that but nothing stops it