Having issues with differentiating Natürlich and Natürlich! (Levels 3 & 4, German for English speakers)

It is hard to differentiate between pronunciation of the word with and without the exclamation mark in the end. Is there anything I am missing?

Assuming that this is about the official Memrise German course (EN-DE): there is a thread specifically for the course here. I’d suggest you post your query there as Memrise’s language specialist(s) might otherwise not see your query.

These errors were on these courses:

Any chance that this can be corrected? There is nothing more annoying than getting an answer wrong because of a missing - or added - exclamation mark, but you got the actual word right.