I am finding the same issue with some exchanges as other members reported before me.
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It's interesting that sometimes I am getting better rates than it was reported on OrangeFren wesbite.
i believe these inconsistencies are usually due to the aggregator OrangeFren data refresh speed and the fast-moving nature of crypto prices
I've seen such inconsistencies too often to blame it on data refresh speed.
Whenever I use a site to compare rates at instant exchangers, I'm looking for the one that gives me (say) 0.2% better rates. If there's a 1% variation between what's shown and what I get, it's kinda pointless.