In the picture you provided it shows venom under the 5-6 champions, when they say the romance crystal I am pretty certain they are talking about the champs in the crystal that is sitting in the odin bundle.
If not then check if it says Venom under where it says a chance to get a 5-7 version of these champs, if he isn't listed then it may be why, if he is listed then probably a bug.
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