Created attachment 145794 [details] Simple columns of data Version 6.0.6.2 Select Autofilter Goto Track column and select pulldown menu options. You should find that there are two selections for the letter M (uppercase). There should only be one. The column actually contains 31 "M"s but the first M will select 12 and the second M will select 19.....making a total of 31.
There are some rows where the content is 'M ' (row#4) plus a space not only a 'M' (row#49)