There is no inconsistency with regard to Ruchi Praja pathi. Sri Vishnu Purnamu [Prathamamsham First Canto, seventh adhyama shlokam 19] and Srimath Bhagavatham [fourth Canto at the beginning of the chapter] states this fact:
Swayambhuva manu had three daughters with his wife Shatha Rupa and there names were Akuthi, Devahuthi and Prsuthi.
Inspite of having two sons, the Manu has given his daughter Akuthi to Ruchi Prajapathi with the condition that he return any male child to Manu. The Manu has done in consultation with his wife Shatharupa.
Now, Ruchi Prajapathi with Akuthi get one son and one daughter. The son was named Yagna and is an incranation of Lord Vishnu.
He has given Akuthi to Ruchi Prajapathi, Devahuthi to Kardma Parjapathi, and Prasuthi to Daksha Prajapathi. Thisis given in Srimath Bhagavatham. However, Vishnupurbnam talks about the marraige of Akuthi and Prasuthi only, since the main aim of this
was to talk about Sri Yagna.
If you want, I can quote the exact Sanskrit shlokas from both Puranas and also give you the references.
Please let me know if you have further questions or need further clarification.
In the service of Lord Sri venkateswara, I remain, Sincerely Narender P. Reddy
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