Are the Apocrypha part of the Christian Scriptures? If not, why do some have them in their Bibles?

Yes, I believe that they are a part of Holy Scripture.
Many people do not know that they were included in the origial publications of the KJV but later were left out because of a paper shortage and the fact that Protestant groups were opposed to them.
So it made it convenient for the publisher to omit them.
Check with the history on that with the American Bible Society.
That's where I found out about that after being told that the some KJV bibles did have them in them.
:)Peace and kindness,:)
Fred

Are the Apocrypha part of the Christian Scriptures? If not, why do some have them in their Bibles?

No, and never were. Some Bible include them as reference material just as other reference material is included. One or more denominations added them to their denominational canon, but they are accepted only by those few denominations.

Closed, sorry we all know where this is going