Hi,
I recognized similar issues as mentioned by BusyBonsai that these feature were better in LimeSurvey 2.x.
I used LimeSurvey 2.62 with the "default template" (I hope this it's right name, I can’t remember if I changed its name) and the input box is left-justified for the question types "multiple numerical input" and "numerical input". See first picture, looks fine.
Whereas in LimeSurvey 3.14 with the theme "fruity" and the question type "multiple numerical input" the input box is right-justified. But in the question type "numerical input", the input box is left-justified. See second screenshot (first two questions are multiple numerical input and the last question is numerical input).
My suggestions: I think the input boxes should be always left-justified because otherwise it is inconsistent. And the large space between the subquestion and textbox in "multiple numerical input" looks inconvenient and should be removed.
I hope you can understand my criticism.