Here is an interesting bit of trivia you may not realize, and it will help to explain an irregular spelling pattern.
Have you ever noticed that words in English do not end in the letter v?
Because of this rule, we add a silent e after a /v/, and it will not necessarily make the prior vowel make a long sound.
This helps to explain why we have words that follow the typical long vowel silent e rule such as five, hive, gave, (long vowel/consonant/silent e) and then words like: give, have, extensive, expansive, pensive, responsive, etc. (short vowel/consonant/silent e).
I’ve heard it said, “The v refuses to be last!”
