MID and other Text functions randomly do unintentional capitalization

[Stef76]

I added a simple custom column to a table. Using MID text function I get the values as of position 4 in the original column. An Example value could be "52 Bikes" which should lead to "Bikes".

This works fine mostly, but in some cases I get a capitalized value "BIKES" instead. This seems pretty random, for some column values it even depends on the number of characters I get from the original value, so MID("52 Bikes", 4, 3) might lead to "BIK", but MID("52 Bikes", 4, 5) becomes "Bikes". Is this intended behaviour and why?? 

[Stef76]

Thnx that makes sense in this context and I was able to solve by adding the column in the query.

[lbendlin · Accepted solution]

Please remember that for the most part Power BI / DAX is NOT case sensitive.  If you have both  "52 Bikes"  and "40 BIKES"  in your data then the function will randomly pick one of the spellings when it forcibly groups the results. 

You can test that by simply creating a table like this

Table 2 = {{"A"},{"a"}}

and then putting the Value into a table visual

Note: Power Query is case sensitive.