I had the same problem here is what I did to fix it :
Fix Push Notifications on iOS 4.3.2 Through Push Doctor:
1: Open Cydia on your jailbroken iPhone
2:Tap on the Manage tab at the bottom followed by a tap on Sources section
3: Tap on Edit button on the top-right and then tap on Add button on the top-left. Enter http://repo.insanelyi.com as Cydia/APT URL and click on Add Source button.
Wait while Cydia updates its sources database. Once done, tap on Search tab at the bottom and type Push Doctor in the search field. Select Push Doctor from the search results and tap on Install button on the top-right.
Once Push Doctor has been been successfully installed on your iPhone, respring or reboot your iPhone. It worked for me I hope it will work for you as well :)