IPO Application -BSE or NSE

I am a beginner and i have some doubts about the IPO application.
I have applied for UTI AMC and MazDock IPO’s through UPI id but both i couldn’t approve the mandate due to some technical issue. i got a mail from NSE with the application number and details. I also applied for the same using ASBA and it was successful and got mails from BSE and it says UPI payment pending when i checked the status.
So is it like when we apply through ASBA ,the application goes to BSE INDA and when i apply through UPI mandate it goes to NSE india. Just out of curiosity.
Anyone ? any idea? Please bear with me if this is irrelevant.