are these harder than regular gmat problems? i literally breeze through the official guides but i feel like these mgmats are so confusing and EXTRA tricky.

They're not harder than all of the questions on the GMAT, but they do mostly represent the upper end of questions. The official guide spans all the way from very easy to very difficult, so the average difficulty level is higher in our question banks. (Not always, there are some easier ones in our banks too - but, mostly, they're on the upper end.)

I was doing well in CR on Questions from OG around 80% and I just did the CR QB and the accuracy fell to below 50%. Hit my confidence.

Yeah, but they're harder questions on average, so that's okay! :)

Remember, on the real test, you're only going to get about half right anyway - you just hope that the ones you get right are hard and the ones you get wrong are VERY hard.