First of all, chapters 5 and 6 are obviously forgery, since they're made up entirely of pastiche phrases based on Paul. Furthermore, the words "Do you not know" are used more here than in the entire rest of his letters, and all of the other places they do appear seem to be additions as well.

Anyway, that also means certain parts of chapter 7 must be forgery as well (specifically verses 2-5 and 8-9), since they draw from 5 and 6. It just so happens that these are exactly the same parts that seem to contradict the rest of the chapter, and it actually makes more sense without them.

Not only this, but also verse 38 is missing in many important manuscripts, and almost certainly wasn't in Marcion's Bible either. This is significant, because it reassures that marriage is still "good" rather than merely "not wrong".

Here is what appears to be the original version of the chapter. I made other omissions here, but they aren't relevant to this particular issue so I won't get into them. But notice how much clearer and more consistent it is.

7:1 Now concerning what you wrote: It is good for a man not to touch a woman.
7:6 But I say this giving permission, not as a commandment.
7:7 And I want all people to be like I am; but each has his own gift from God, one this way and one that.
7:10 Now to the married I command, not I but the Lord: A wife is not to be separated from her husband
7:11 (and if you are separated, stay unmarried or reconcile with your husband), and a husband is not to send his wife away.
7:12(a) To the rest I say, not the Lord:
7:28 If you have [also] married, you have not done wrong; but such people will have trouble in the flesh, and I am sparing you.
7:32(b) The unmarried man worries about the things of the Lord: how he can please the Lord.
7:33 But the married man worries about the things of the world: how he can please his wife. He was divided.
7:34 The woman who is unmarried worries about the things of the Lord, so that she can be holy [both] in body and in spirit. But the married woman worries about how she can please her husband.
7:35 And I say this for your own benefit, not to put a restriction on you, but for what is noble and devoted to the Lord without distraction.
7:39 A wife is bound to her husband for as long as he lives. But if her husband has died, she is free to be married to whoever she wants (only in the Lord).
7:40 But in my opinion she is blessed if she stays this way; and I think that I also have the spirit of God.

In the last verse, "blessed" is also a variant against the traditional one, which is "more blessed".

Of course the church wanted to alter this. Can't have one of its religion's founders endorsing singleness too much! Gotta be having lots of babies and adhering to gender roles! Fraud and forgery as usual.