The fields of data processing, mathematics and technology have a history of being heavily gendered and dominated by majority groups, most notably white men.
The situation has changed to some extent, especially during this millennium, but things are still not equal enough. AI systems have particularly been developed by companies and teams where women, older people, minorities and people in difficult situations in their lives are clearly underrepresented.
As AI systems almost inevitably come out looking like their makers and meet their specific needs, the results are often embarrassing, harmful or even useless for different groups.
For example, it has been widely known for a long time that facial recognition systems have problems with ethnic groups, but the issue still persists.