ものだから vs. から

Recently I started taking in-person classes and my first grammar point in the class was ものだから, as I finally have some classmates, wanted to make a note.

ものだから

more like you did something wrong and want the other peson to understand and forgive (體諒). It’s like I can’t help it and got to this result. more emotional.

鍵を無くしてしまったものだから、家に入れ何んだ。
I happened to lose my keys, which means I’m stuck outside.

マナーモードに設定していたものだから、着信に気づかなくて。
My phone happened to be on silent, which is why I missed your call. (I hope you understand!)

から

on the other hand から is simply stating the exact cause-and-effect relationship.

マナーモードに設定していたから、着信に気づかなくて。
My phone was on silent, which is why I missed your call.