Option trading volume inconsistencies

May I ask for your opinion on option trading volume numbers?

A recent example might be DNN (Denison), a call option,expiration Mar 19, strike $2.50

Yahoo says in the option chart that the volumes were 85m Feb11, and 64m Feb16 (yesterday).

On Barchart Premium I found volumes 338k for Feb11 and 206k for Feb16, which seems reasonable.

When looking at Robinhood option data (10minute interval or similar), there
are prices but the volumes are all just zeros.
I have no other data sources.

Does it mean that Yahoo’s option historical volume data is a nonsense, a bug
or it means something?
I assume Robinhood has the data but might not want to publish too much (Citadel activities???)

I also noticed tha
t the sum of Robinhood stock intraday volume data is much
less than a total daily volume on Yahoo/Barchart. So not sure about
Robinhood data in general.

But Barchart also says that the same option (DNN210319C00002500) for
Feb10 is 6k volume and 2k open interest.
Feb11 is 338k volume and 7k open interest.
Feb12 is 144k volume and 149k open interest.

Does it mean that Feb11 only 5k new contracts were opened but they changed hands
many many times? And Feb12 almost all actions were new contracts with
almost no trades?
Or am i wrong? Or incorrect data?

Thank you