Hi! My apologies if this ends up being a silly question, but not knowing the answer is irritating me.
I understand the basic patterns for short versus long vowels, but this particular ending seems to break them (at least when it's an adjectival ending).
I know that "it's just an exception" can be a correct answer when it comes to languages, but if there is a reason for the short vowel, I'd love to know what it is, so please don't feel scared to throw some linguistics at me, especially if it would help me understand those patterns better.
Thanks!

