Issues in editing pdf's in "Hindi"

Hey there!

Well I have been trying to edit a pdf written in "Hindi" language although I have been facing a lot of issues during the editing process. Whenever I add some text in Hindi using the "Mangal" font, I am able to write the text at first without any problem. Although, upon saving the the document and reopening it I am not able to edit it as the text gets "mushed" and "unintelligible".

Here is an example of what exactly the problem is: 

Before Saving (on writing for the first time):

"लोरेम इप्सम डोलोर सिट अमेट, कंसेक्टेचर एडिपिसिंग एलीट, सेड डू ईयसमॉड टेम्पोर इंसिडिडंट यूट लेबोर एट डोलोर मैग्ना अलिका।"

After Saving (and opening the document again):

"लोरेम इप्सम डोलोर 􀀁सट अमेट, कंसेक्टेचर ए􀀃ड􀀄प􀀁संग एल􀀂ट, सेड डू ईयसमॉड टेम्पोर इं􀀁स􀀃डडंट यूट लेबोर एट डोलोर मैग्ना अ􀀁लका।"

Extra Info:
1.) I have the font enabled to be "embedded" and when upon checking the Fonts in the file, I get the following:

2.) Also, on an unrelated note whenever I set the font to be "Mangal", I get the following error message alongside the text box (although other Hindi fonts like "Devanagari" just don't work): 

Thank you for viewing my query and I hope someone can help me out with this issue! (or at the very least suggest any alternative editor/tool)