Negima relation confusion

[HiEv]

I see a problem, but I have no idea how to fix it.

There is:

1) Mahou Sensei Negima!
2) Negima!?
3) Mahou Sensei Negima! OVA Haru
4) Mahou Sensei Negima! Natsu Ban

#1 is listed as the parent of #3, #2 is listed as the parent of #4, but #3 and #4 are both obviously based on the same thing, as they are both shown on the same page:

http://www.starchild.co.jp/special/negima_ova/

Also, looking on that page the titles of #3 and #4 should actually probably be something like:

3.b) Negima!? Magister Negi Magi - Haru Special!?
4.b) Negima!? Magister Negi Magi - Natsu Special!?

At the very least, #3 and #4's titles should be in the same format, with only "Haru" (spring) and "Natsu" (summer) being different.

I've been downloading these, but I haven't watched them yet, so I don't know how to correct the relationships, but clearly they need to be fixed. At the very least someone needs to add a relationship between #3 and #4, but I don't know what relationship to add myself.

Thanks.

[Karasuhebi]

IIRC, the OVAs are side-stories to the main story being Mahou Sensei Negima! but they are drawn in the Negima!? style.

-Karasuhebi