Street Fighter

I'm very new to fighting games, and have been practicing getting my inputs right with some simple Ryu combos.

I was practicing doing s.MP, od-tatsu, heavy DP into lv3 super in the corner and got pretty consistent landing it.

Then I decided to test it after a blocked DI corner crumple, and the super will never come out. Even after tons and tons of attempts, the super won't come out. But without the DI at the start I get it every time. I don't really understand what is going on.

Is there some game mechanics reason why it won't let me cancel DP into super after the DI corner crumple? Or am I just bad? 😅