Gap between bars in histogram created with Tableau - How to interpret and remove the gaps?

I'm currently working on creating a histogram in Tableau using a bin size slider. I have set the bin size to 10, and I want to display the percentage on the x-axis and the frequency of students on the y-axis. However, I noticed that there are gaps between the bars in the histogram that I generated (attached image).

I have seen other histograms created with Python (not relevant to the project), and they don't seem to have these gaps between the bars as shown in the following snap. . I'm struggling to understand why this gap is appearing in my histogram.

Is there something wrong with my approach, or is this the correct representation of the histogram? If this is the correct representation, how should I interpret and read this particular histogram?

I appreciate any insights or suggestions on how to remove these gaps between the bars in my histogram.

Thank you in advance for your help!