I've had this issue once before. Today I noticed that my Kanji learning streak was broken, even though I did study. Since it was over 300 days long, I'm a bit sad. It's not a big deal, but the streak really motivated me every day.
There might be an issue with the tracking.
I don't know if this will help or not. I also use the streaks for motivation, and to make sure I am reviewing a bit of everything. Lately one of the first things I do in renshuu is to knock off short quizzes in vocabulary, kanji, grammar and sentences. Then I use the control f function and search the word "done" (this is easy on a laptop, I don't know about searching on a phone though.) If the result is 4, I know that all four are "done for today" and my streak or streaks seem to continue.
