Problems with PDF as a Source

Hi, i have problems whe use a PDF as a source. 

 

Let me show you: A: When i select the PDF, Severals column (in this case Column2) had strange character

 

PDF selected

 

B: When i made a refresh (button in the right corner) , the characters are corrected (Column2 now are OK)

 

Refresh

This could be easy to manage only a refresh in this step. But when i use a folder (with PDF) as a source, the refresh is not working and load some PDF files with this strange characters and not corrected with a refresh action.

 

Query Editor with Data with Strange Characters

 

 

Query Editor after a Refresh Action with some Rows now OK but others rows with strange Characters 

 

After a Refresh

 

And after a New Refresh Action : The Row 44 now is OK but others that are Ok now had the strange characters

 

And after 3 more Refresh this Rows are OK but the other are Wrong :mansad:

 

Anybody got a way to solve this or is a issue from PBI (for now)

 

Thanks