Ghost cospend category

Hello everyone,

I have installed cospend app to manage project money. It work perfectly fine except that that I have an unexisting category showing up.
I only have 3 categories for expenses but they is a forth one appearing when I create an expense called ā€˜reimbursementā€™ and I would like to delete it.

If anyone would know how to do it, it would be appreciated, thank you.