Just so everyone is aware before they read this, I was playing the 1.7.0 version of this mod.
Yea, nearly a month later and I found out that it's not my computer. I tried out the mod on my friend's computer (which is an MSI with a GTX 1040 Graphics Card), and I went to land at the Lua base, and when I went to plant the flag, the kerbal this time wasn't spinning, but still wasn't moving, so I tried to quicksave the game, exit and join back, but I literally couldn't click anything. Clicking the "space center" button on the top of the screen wouldn't' work, pressing escape and clicking "exit game" wouldn't work, and when I toke down the flag and went to plant another one, I consistently clicked the "plant flag" button, and the kerbal wouldn't place a flag, and the flag counter went into the negatives (don't know why this was implemented in the game).
TL;DR: Thought that mod was buggy because of my computer, but later found out that my computer wasn't causing the issue.