Illegal Pitches

[Riddy]

I am not an official. I am a softball fan and my daughter pitches. I watch a lot of college softball. Mainly SEC and Big 10 and whatever is on ESPN. I would like some input or reasoning or clarification as to why Illegal pitches are not called or maybe they are not illegal pitches. There is video of them on youtube to check out. For Example

Silkwood from Mississippi double plants
Littlejohn from Alabama- double plant and lands outside the 8 foot circle
Carlson from Auburn lands outside the 2 foot wide alley allowed for pitchers.

I have watched other pitches and some leap but it is very hard to see. The examples I gave are very obvious.

I am looking for an answer.