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Pretty sure you're fine. Out of all the scoring websites/reports you use Discover is the only one that's accurate for reporting your score since they use the FICO scoring model pulling Experian I believe. Others like Credit Wise and Credit Karma use a different scoring model (Vantage I think) that most lenders don't use at the moment.
For most free scoring reports I would just use them for monitoring changes on your credit such as new accounts, balances, inquiries, and so on. When you want a true FICO score review from all 3 bureaus use a service like myFICO or Credit Check Total to get your scores.
Then I would suggest Credit Check Total then. For a $1 free trial you can get your 3 FICO scores and once you do just cancel the membership before the 7 days are up. A lot of people on here do that when they want a quick glimpse. Or if you do want to keep it cancel it anyways and I think they offer half off membership. There are threads on this on the forums if you search for it.
I haven't had experience with myFICO but I'm sure a quick forum search will give you the info you need for what they provide as well.
That's good to hear! And no problem.