Looking at your profile shows that you have voted 34 times today as of writing this. You can see this in the lower right hand corner on the desktop version.
The thing about votes is that you don't necessarily always have 40 votes. To cite for example Daily vote limit reached on 37 votes:
There is a limit of 30 all-purpose votes per day and 10 question-only votes.
The tricky part is that you have to spend your questions-only votes first.
There are special votes that can only be used to upvote questions and these have to be used first if you want to have a total of 40 votes on any day.
Other than that you might be in a different timezone making your personal day different from the UTC day so that what you define as "yesterday evening" could still be counting for "today".
But in this specific case you just have used up all your general-purpose votes today and as you upvoted mainly answers you don't have the full amount of 10 question upvotes for today. Today your maximum seems to be 34.