Hello,
Thank you for making a bug report!
If you don’t mind, could you share your Deck code? You can go to your deck manager, click the deck and then click Export, select “Clipboard Code” and then paste it in a reply here.
Omega will only present you with options that are legal to activate. If you did not have a Reptilianne spell or trap in your deck, other than itself, then it would not provide you with the option to add one. I see that you have one of the traps in your want and simply want to verify that you had a legal target in deck.
Thank you!