[Strange column added when support activated]

thank you for your answer !

Do you think it is very necessary for TPU & PVA ?

[Strange column added when support activated]

Hello,

 

When I'm configuring my printing in cura, a strange thing happend.

I am on an ultimaker 3 extended and the thing I'm trying to print is in TPU95A. I wanted to generate a support in PVA.
But when I do that, a strange column appears in the corner as you can see on the picture. It's not in the design I want to print

 

What is that, is it usefull, can I remove it ?

Thank you for your answer