Gradients corrupting

How do I solve this issue:

If I Have a gradient in a vector and I

1. paste it into photoshop or

2. if I send the document and someone else opens it

The gradient changes to black/white and sometimes keeps one or two color (but not the right ones).

And plot twist, it doesn't happen with all gradients or all the time (probably 75% of the time)- and I can't find a pattern to when the gradient works and when it doesn't.

I have NO idea how to fix this issue and I've tried just about everything.  Anyone ever have this issue/knows how to fix it?

Ex. here's what the gradient should look like:

And here's what it ends up looking like:

[Discussion moved from Adobe Creative Cloud to Illustrator - Moderator]