Why would you say that? Is there any reasoning behind it, or are you just throwing out an answer?
To Rich Hand, I take bodyweight into account when I lift. For lifts like the squat, I assume ~80% of bodyweight is being lifted, whereas it’s closer to 40-55% for DLs or good mornings. Lunges are ~80% as well.
As you have discovered, not taking bodyweight into account will lead to problems, especially at lower strength levels.