Time travel happens
It’s best not to think too hard
Just relax and watch

This one is good but has a lot of plot holes in it, but one could chock that up to the rubber-band theory of time-travel in which the events one has gone back to change take a little while to reach the present day. I mean, there’s two different Godzillas and King Ghidorah gets mechanized. I also didn’t know about this movie until like 1998 because after Godzilla 1985 and Godzilla Vs Biollante they weren’t as widely marketed.