if i'm missing some topic vs if i missing some topic

Some examples from the web:

• I feel like I'm missing some backstory.
• Many times in life, I feel like I'm missing Some essential piece of the human puzzle.
• Many times in life, I feel like I'm missing some essential piece of the human puzzle.
• It's like I'm missing some happy part of me.
• Except for one thing: if I'm missing that audition...
• I don't care if I'm missing.
• Unless, of course, I'm missing some sort of secret weapon?
• If I'm missing, nobody will know I'm dead.
• If I'm dead, nobody will know I'm missing.
• If I'm missing, the President of the United States is looking for me.
• If I'm missing, the President of the United States is looking for me.
• Keep running it over and over in my head, trying to figure out if I'm missing something.
• But if I am missing some big change that is taking place, I would like somebody to show it to me.
• I can't be no soap opera actress if I'm missing digits!
• I'm missing something, I'm missing something, I'm missing something.
• I keep thinking that I'm missing something.
• Feels like I'm missing something.
• I'm missing my wisdom teeth.
• I'm missing my favorite scene...
• I'm missing all my shows.

Some examples from the web:

• But if I am missing some big change that is taking place, I would like somebody to show it to me.
• Here are some topics that interest me: quantum mechanics, trains, flags...
• Some topics have more than one breakdown, each with different levels of detail.
• Now ladies and gentlemen, we'll discuss some topic.
• It would be desired to keep this timing but we point out some topics in the report.
• Some topics might even have to be excluded from the report in order to stick to a concise and sound text.
• So, professor, in addition to research I had requested, I allowed myself to deepen some topics and of course I brought entire bibliography... good.
• There will be competition between proposals both across and within research topic areas in this call, which may result in some topics not being supported.
• And maybe I am missing some stuff on the good doctor.
• I am missing some of my and our friends.
• Eventually, I started missing some bets.
• Looks like he's missing some hair, too.
• It seems her father reported her missing some time in November.
• It's because the elevator is missing some important instrumentation, like the buttons.
• Just missing some food from home.
• As to the exit, we're missing some skull fragments.
• Maybe we're missing some pages.
• You're missing some buttons there, stud muffin.
• I still seem to be missing some assessment grades for them.
• I feel like I'm missing some backstory.