Colour change/glitch when exporting file as JPG in Illustrator on the iPad

No idea why this is happening, is it a bug? Is it me?? It hasn't happened with previous file exports. There is a colour glitch/change to part of my artwork when I save my file as a JPEG  on my iPad pro.

Please see screenshots of the problem.

a) As the artwork appears as I created it on the Illustrator iPad app

b) Colour glitch when my artwork is exported to a file as a JPEG on my iPad.

I have tried to re-save it umpteen times to no avail.

Has anyone else experienced this problem, and is there a way to solve it please?