<CHECKNUM> Check Number exported is mapped to a custom field instead of Num or Memo?

<CHECKNUM> Check Number exported is mapped to a custom field that can only populate 1 consistent piece of text. Should <CHECKNUM> not be mapped to Num or Memo instead?

Attached 2 examples with screenshots on how the mapping was done.

1) Mapped Num to check number column, but not exported. T

2) Type looks like it is only exported as "Other", but not what is in the Column or put into the custom field 

Thanks for such a useful tool overall - if you can help address these issues that would be great!