Form recognition not working for check boxes

I had the same problem, from my limited testing I found out that the checkboxes are not getting recognized most of the times because the distance between the checkbox and the text is too large, I have highlighted the distances in an attached example image to better show the distances that are ok (in green) and the distances that are too long (in red) and do not allow the checkbox to be recognised.

If you make that distance shorter they should get recognised (this should be the same with square bullets, word control boxes, square characters and square shapes given they have a margin thick enought for the detection algorithm's likings)

I usually personally make forms with a giant table in word with invisible borders to format and place everything, I then make the bottom border of a cell visible (any color seems to work) to make that cell a writable text field (I know you can also put underscores but that approach gives less refined results from my experience), to make it a checkbox field I usually add the word checkbox in the table cell.
In both cases you need to make sure that the distance between the text describing the text field/checkbox and the text field/checkbox is as short as possible (as shown in the example image).

Another small trick if you are using the "table method" and you can't get the cell with the text describing the text field/checkbox and the text field/checkbox close enough to get detected is to hold "alt" while moving the line separating the 2 cells to get more fine control, if that is not enought either you can trick word into moving the line closer by adding an empty row below and then after that another empty row (2 rows down) where you add with the table drawing tool a line that is slightly closer than your original one, you can then move the original one and it should snap to the temporary one you created below without making the text describing the text field/checkbox go to a new line in its cell.

In conclusion I would say Adobe seriously needs to improve their automatic form detection/creation algortihms and make things like this invisible maximum detection distance configurable by the user, they should also add support for things like multiline text fields and others.