Ah yes, this happens a lot.
My suggestion is to try to implement one or two changes at a time. As you adapt and improve your game, you're going to find yourself in different situations to what you are used to. For me, one of my biggest leaks was (and still is, but to a much lesser extent) that I was way too tight. When I started opening up my range, I would find myself in all kinds of weird and wonderful spots, especially out of position, with weaker hands than I was used to. When this happens, you should mark the hand to review later and see how you should act. Note that you should take the opportunity to run various different scenarios, not just the exact flop that occurred in the hand you played.
Remember that Rome was not built in a day. You cannot study a topic and expect to play that spot perfectly every time it comes up every time in the future. Studying is an ever ongoing task; each time you solve one leak, it will likely create other questions and problems for you to review and solve.