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Well, finally someone facing the same shit happened as I did before.
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An easy way to count is from the ticket you are getting during the week, new weekly getting started after the ticket geeting reset to zero (0). A few weeks ago, I complained as well about these happening to me.
I have (13 tickets) weekly, and there has a drop of 24$ wagering from 7-8K to 12K. 75,000$ weekly ticket progress is 1,000$/1 ticket based on the progress I should have enough wagering to claim that drop.
My post during these hapening:
Shit happened this week.
During the stream, I successfully claim 3 codes but the last drop (24$) cannot claim because (I don't have enough waggers to claim). However, the last drop minimum wagger is from (7,000 - 12,000$); I have 13 tickets (1,000$/each).
So, during these weeks should be around 15,000$ waggering for my account but cannot claim ~LOL. I guess the error are not only on weekly but the waggering counted as well, last drop was huge is because 24$.
My ticket weekly 75,000$:

Drop amount & wagering requirement to claim the drop:

Rate Ticket 75,000$ Weekly (1,000$ = 1 Ticket).

If someone asking, I doing wagering during the stream (off course not).
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So, everyone, you don't need to make assumptions about how much you are wagging during the weeks. You can always check based on the ticket weekly you are getting and the current ticket progress:
https://stake.ac/?name=YourUsernameStake&tab=giveaways&modal=user