I have a spreadsheet with a bar chart already in it (it's showing the number
of quotes sent monthly w/ trendlines). In column A, I have a month-year and
in column B, I have the number of quotes sent in that month. I changed the
source data to display a different set of months, and the bar widths narrowed
down to the width of a line. I undid the change and the bar widths went
back. I then tried to edit the chart formula one cell at a time and found
that when I reached a particular month forward in time, that that's when the
change occurred (row 40).

I thought maybe it was because I was adding too many months to fit in the
chart, so I started removing months on the front end of it to keep the total
number of bars static but that didn't make an impact.

Then I noticed that as soon as I add that one month to the source data, the
bottom axis (is that X or Y, I forget) switches from monthly to weekly which
is why all the bars change width.

So my question is, what is it about that cell is causing my chart to switch
like that? I only have monthly numbers in column A, no weekly numbers.