Ohhhhh you have ISX. I didn't know that. I think that's why your NC doesn't show Twitter notifications like mine. I just use the stock NC with Springtomize set up to show 20 lines instead of the default amount. I have never used ISX so I don't know exactly how it works but I assume it renders notifications differently than the stock NC, and therefore when you follow my instructions they don't work correctly.
To confirm once and for all, you could try disabling ISX temporarily (you might have to uninstall it, I'm not sure) and only use the stock notification center with the Springtomize "custom lines" option set to 20 (or more if you would like). I am willing to bet that ISX is the reason your twitter notifications don't look like mine. Do you have Springtomize? If so, give it a shot. I am curious to find out what's going on here.
Edit: On second thought, before disabling ISX, have you tried changing the Springtomize setting to 20 lines while keeping everything else exactly the same? Based on your pictures, you have the Twiter notification settings the same as me, except I have mine set to show 10 Recent Items whereas you have it set to show 5. But that's a minor difference. The major difference here is that you use ISX and I use Springtomze.