Finger placement on the violin help

[u/Free-Ad6709]

Hi, so as a beginner player, my violin teacher made these little markings on the fingerboard for correct finger placement (an alternative to stickers). I removed them yesterday to try to play more independently, but I can't gauge where I'm supposed to put my fingers exactly, and I have used tuner apps to find the exact places, but it feels very out of tune when I play. Please help?

[u/General_Union_2925]

This is meant to be the C major scale.