First of all, i'm kinda new to Inkscape (or at least i haven't fully explored all of its features) so this question is very likely to be simple and noobish. I looked on the internet for help already but most of the results for "Why is the line thickness not consistent" or "why is line thickness changing" brings up noob tutorials for how to draw straight lines or change line thickness.
Anyway, the title is a little bit misleading. The line thickness isn't being weird, it's just i probably pressed a button i don't know about and can't find again. The thickness on the line vertically is thinner than when it goes more horizontally, similar to the effect from the

tool but i drew it with the

tool. So how do i turn it off?