not least of which is because

[abre]

Hi,
This is the first video in the probability module. Probability is a tricky topic for a few reasons, not least of which is because many people have all kinds of misconceptions about probability.

What does the bold sentence could possibly mean ?

Thanks!

 

[grassy]

It means "one important reason is that many people have all kinds of misconceptions about probability".

 

[Hermione Golightly]

I think the word 'because' is wrong there. It should be 'that'. What is the source, please?

 

[abre]

thanks for all！