UBER is stealing our tips. Now I have a proof!

For the last week or so, I have noticed that I haven’t gotten 100% of my tips as shown on the Uber Driver app. For some reason, some of the tips, not all, changed into "Miscellaneous" with some cents missing. I am unsure how long or how often they skimmed me. Has this kind of thing ever happened to you guys??

I just want to hear what you guys think or recommend before I contact their helpless desk. Is a class action lawsuit a possibility in this case?