My Matrix table does not accept having 0 values

I have, however, discovered a bug. I had to go and amend the columns in my table as I had missed the '0' off the scale. What I have discovered is that it doesn't like having '0' selected as a value for a column - if this is checked when completing the form, this will be ignored by the system I have found a work-around by simply adding a full-stop after the '0' in my first column, but thought I had better make you aware of this - if it is a simple fix then please let me know

I have cloned your form, but I can not reproduce the issue with '0' column values.

Is there are any specific steps to reproduce it?