Charts can have different types and settings. Where possible at all attach a file containing a reduced example document clearly showing what you have and what you tried.
Images are only appropriate if there is an issue wiuth the view.
Back to the charts:
You may have left some settings to automatisms, and its unclear to me how you got what your image is showing.
Anyway, equally numbered days of consecutive months aren’t equidistant on a time-axis, and can therefore (imo) not be scaled based on the automatisms used for X-Y-charts.
You may need to resort to line-charts which requires to give the texts used as labels for the horizontal axis, the “categories”, explicvitly, and generally to take the full responsibility for the result.
See this example:
disask99980chartingAsIfMonthsareEquidistant.ods (46.6 KB)
BTW: Prefer the unambiguous way to show dates specified by ISO 8601.
Any regional/national/traditional so-called “date format” causes misunderstandings and additional problems.