Form Select List Limit-1534361625

I have been working with select lists within forms and have noticed that some of the larger select lists get cut off for some unknown reason. Once I noticed this, I exported the CSV where the select list is pulling from and imported it into Excel. This CSV has about 1,300 entries. Once sorting the list from A-Z, I noticed there were only 1009 entries. For some reason, the select list is getting cut-off. This is an external select list. 

 

Is there some type of limit on select lists within forms? If so, is there any way to change such limit?

I have the same question.  The cutoff limit applies in this case to a file connection.

I have the same problem, someone solved ?

If I remember well, the csv file size is limited to 4Mb.
So please check to remove whitespace while creating an export in Excel
Did you specify a filter on the external list ?