#3 Nicco Montano
One of the most recent incidents on this list, Nicco Montano was unable to fight at UFC 228. As a result of this, she ended up being stripped of the title.
Ahead of UFC 228, it had been expected that Darren Till might not be able to make weight, making the championship bout a normal one instead. Not only did Till make the bout, but it was the Women's Flyweight Championship instead which saw the controversy.
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Montano had become the inaugural Women's Flyweight Champion after defeating her competition. However, she would not be able to accept a schedule for a Championship fight for another nine months. When she was finally set to defend her title, effects of weight cutting saw her fall seriously ill.
The illness was enough for her to not be able to make her fight with Valentina Shevchenko, and the UFC ended up stripping her of the title.