How do you get a custom variable to save in pipeline?

Summary:

Trying to add a new variable to a pipeline is difficult as it won't consistently save.

Content (please ensure you mask any confidential information):

Whenever I try to add a new variable to a pipeline it won't consistently save. I try to add a new one and hit save. The window closes indicating that it completed. I reopen the variables window to ensure it is there and 99% of the time either the screen is blank or shows all of the old variables and the new one is not there. I will redo this process MANY times until eventually it saved. Is there a trick to getting this to actually work consistently?