Line graph width and categorical vs continuous

Hello,

I have the following table:

And this is that table graphed:

For the x-axis, I am using Date hierarchy Day, drilled down to Time, which is below it:

And for some reason, when I try to set the x-axis type from categorical to continuous it just goes back 

If I try to use Day or Time alone, then I can set the type to continuous but not when I have them both and am drilling down to time

Can anyone provide a solution for this?