The Saint's Magic Power Is Omnipotent

The officials in Salutania fail to realize that the saints they summon would have sudden values from their kingdom or world.

Both Sei and Aira come from Modern Japan, which is lot more free and modern than the medieval world they were summoned to.

Sei for one loathes the sense of modesty Salutania has for women. Having to keep her calves covered all the time is annoying, resulting in her often using a foot bath to cool down. Leading to her being exasperated a lot with how everyone reacts.

Aira unintentionally causes friction with noble girls as she doesn't know about the who ridiculous rules about not talking to betrothed men. Even the prince was stupid enough to not take the different world would have different values than his.