Over 100% is impossible, so it definitely seems a bit high. The percentage is the percentage of total battery use, so if a total of 30% of your battery was used, YouTube used 90% of the total battery? I doubt it. (And if you add Chrome, 120% of your battery was used - that means free power, and if you play it right with Elon Musk, you'll be a billionaire before the end of the year.)
I agree with you, I probably am misunderstanding something.
When I go into Device Care, the percentages I posted were in the list of apps that appeared. Then, if I tap on battery usage, the percentages are different. The stats are different today thsn yesterday, but as you said, it would be impossible to have percentages over 100%, so I have no idea why it said over 100% for both of those apps yesterday. I included a screenshot for refefence. Would you know what I'm getting at or what I'm not understanding?