Variable Framerate / VFR is a result of videos shot on phones or screen capture devices (phones tend to be worse, but it really depends). The way you can think about it is much like in a video game when you go into a really graphics intensive area and your framerate drops to compensate, the same thing is happening when your computer/phone is struggling to keep up with a recording, it will drop the framerate to keep up. This plays back okay in a video player because the player can change the framerate on the fly, but when you're working in editing software you're typically working in a sequence with a dedicated framerate. Timecode is important. It wants to know exactly where things are happening with frame precision. When you are constantly changing the rules, it causes problems (Over here there is 25fps, but over here it's 30fps, etc.) This typically results in playback issues, audio going out of sync, and other wonky things.
I can tell that you're working with VFR because 1) You're clearly working with a phone shaped video, but 2) your sequence framerate is not a normal framerate. When you see odd framerates on your clips, that's a strong sign you're dealing with VFR. I would personally recommend setting your sequence to a standard framerate, even if your media is not.
Now that I've given you my best go at an explanation, I would also recommend you take a look at this article: https://www.reddit.com/r/VideoEditing/wiki/faq/vfr
This will go over methods of finding VFR as well as solutions. It links to some of the software that can transcode to constant (which is important if you're keeping audio in sync with video). It also links to Adobe's post on working with VFR (although it can be bad enough that their in-program fix may not work.)
While it's ideal to address these things prior to editing, for obvious reasons, the good news is that even if you've already started an edit, you can transcode to constant and replace the files in your edit. It may take a little bit of slipping and make sure you're getting your clips back into place, but it's better than starting over entirely.
In your case, if you're not worried about audio sync with your phone clips, you may not need to worry about all of this stuff right now. And if the audio drift isn't an issue, you may actually be able to transcode your media prior to editing with AME. You'll burn in the results of the variable framerate, but the resulting file would be constant. (You couldn't go back and correct the audio drift at this point unless you went back to the original file.) I'm only human so I could be mistaken on some of these things, but this is at least what I understand of it to the best of my current knowledge. (Whew. That was a lot of typing.)
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