Notifications were removed from the website with the new website changes at the beginning of February. They also removed the verbiage about you getting the ten percent lingot award, but the last time I checked, I got the award.
I do believe that someday Duo will put a stop to that ten percent award because they removed the verbiage about it. 5 days ago I got 151 lingots for a 1510 streak, so I still got the award the last opportunity I had to check. There's no notification, but lingots were incremented.
As for the different totals I can only give a vague answer because I can't recreate the problem. Sometimes I'll receive the daily lingots award and my lingot count will be incremented by the award. It's anywhere from 1-5 lingots. Sometime later on I'll check and find the lingot total displayed in the web dropped down to the original amount at the start of the day. It was as if I didn't get the award. Then I might find myself not getting the daily award for a few days, then suddenly, they'll all come back and be displayed in the lingot count.
It appears that is what is happening in your case due to the amount of the discrepancy. The member in the right is two less than the pop up box, and that's a typical daily award.
For these types of errors you should report them through Duolingo's Bug report form. My experience there is they never get back to me but they fix things that I report if I can give them precise details on how to recreate the error.
I wrote more about the new website changes here but I think I've told you enough here so you don't have to go there.
I've also asked Duo in bug reports for an accounting ledger on lingots so we can give more accurate & precise details on bug reports. I'm sure we'll get that quand les poules auront les dents.
..and please don't laugh at me for using windows, i need software for work that will only run on it 
