Hi DebbieChats.
I recall that, when I was preparing for the GMAT, I experienced something similar to what you are describing. Having seen many flawed practice questions, I began to expect questions to be flawed, and so, I wasn't operating optimally when I went to answer even official questions.
Clearly, there's no reason for you to become less confident because you are having trouble finding the supposed correct answers to flawed questions. You can tell that those questions are flawed, and that your answering them "incorrectly" does not reflect your actual skill level. At the same time, seeing flawed questions can affect your attitude toward questions.
Meanwhile, your concern that verbal questions that you will see on the actual GMAT will be flawed is not entirely misplaced. Occasionally, a question that appears on the GMAT will be a bit flawed, as one can tell from the fact that some of the verbal questions, a very small percentage, that appear in official practice materials are slightly flawed.
At the same time, the truth is that the vast majority of official verbal questions are well written and have one clearly correct answer, and you can expect to see well written questions when you take the actual GMAT.
So, you can be confident that, if you are well prepared for the verbal section of the GMAT, your score will reflect your skill level.
To become accustomed to the experience of answering well written official questions, you could practice by using official verbal questions.
One good source of such questions is this set of questions.
https://www.mba.com/exam-prep/gmat-offi ... -questionsAlso, if you have run out of official practice questions, you can improve your verbal skills by analyzing verbal questions that you have already seen, doing things such as looking for multiple flaws in Sentence Correction answer choices and analyzing the logical relationships between Critical Reasoning answer choices and the passages.