By weird I mean the logic and the pace of the whole story.
MC is a high schooler who isekaied over and can see the future. For whatever damn reason, she REFUSES to tell her parents and the rest of her family about her ability to see the future that would cause ruin (it's definitely fixable if she told them) and just emos in one corner, thinking about running away. For starters, she wants to run away as a CHILD, which is ridiculous. Then she just continues to emo every day even after her brother is born. Her family is concerned about her lake of liveliness but since she doesn't tell them jackshit they cannot figure out the problem. Anyway, after the initial show of how hardworking she is, the story takes a dramatic turn and she becomes an ultra Mary Sue. She suddenly can wield holy magic yadadada and then bam! the prince also has some kinda ill omen (relating to her) that appears really cringe. Not to mention, every darn 3/4 of a chapter someone has to comment on how "beautiful" she is, more so than how talented she is (I mean come on, she's supposed to be the heiress of a warrior dukedom). Anyways, it's a really, really random story where the author doesn't put in enough effort to make a case on WHY we should care for the characters. The MC especially doesn't even think logically and there are leaps of logic on every chapter that make you question the purpose of the story. To sum it up, it is kinda cringey.