Option Volume Differences?

A

antares66

I noticed differences in option volume at IBs TWS and barchart.
For example IB shows me for NVDA a volume of 122k, at the same time barchart shows a volume of 251k.
For ELAN IB shows me a total volume for today of 38k. When checking the window for all calls and puts i get a sum of 1.5 k (max) when adding all calls and puts manually.
Could someone explain this to me?
Thanks
 
THis is at 12:40pm ET on Lightspeed Trader. Check with both now. Our volume includes all exchanges and dark pool prints with pre-market volume.
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