I have 75 lingots on my profile, but only 5 show as available in my account
I can see 125 on your account. You could try zooming out a little, sometimes it cuts off what you can see for the lingots. I don't see where the 75 lingots have come from but it could be the same problem making the 2 look like a 7.
Edit: Oops, I have just noticed some has donated 50 lingots to you and 75 + 50 = 125.
"I can see 125 on your account" how can you do it ? I mean how did you know how much lingots he has
You put the following url into your browser's address bar. "Www.duolingo.com/users/[yourusername]" and this opens a page containing a lot of html code and then you can use your browser's Find On Page command and look for "rupee" this will show the the word Rupee followed by the number of rupees you have. Hope this makes sense.