Need help!! Problematic Knight Chess!?!

So due to slow progression in our incomplete assignment, our dear lecturer scolded us for that (haha lesson learnt~~ next time do finish what is expected LOL><'') and guess what? He actually just let us spent 70% of his class time to let us finish our things~~ (How nice of him~~ gonna credit him for doing so maybe?XD)

Even though it was really a big push for us to complete 80% above of progression, that doesn't mean that we don't have to do anything that's gonna taught on that day~~ So he has us copy 2 videos about how to model up chess piece (again chess zzz but in another way haha)through lines by creating more points in between the outline points and adjust the height (literally something like you gonna give a volume/depth to the points).

However, I had encountered a problem somewhere around where I need to pull the whole thing and I realised that some of the lines weren't joining and the points I pulled up were messy and weird. GOSH zzz... I have to rush my other works and yet I'm halted for about 2 hours+ just to figure out what was the problem there and pretty much wasted my time cause in the end I solved nothing...XD zzz...... Oh please could anyone help me with this!?! (My friend did ask me to rejoin the point which allow some points to work fine but still the problem was just minimized, likely didn't really solve my issue @@)

Most of the points are joined together but that were still some which left out and this really frustrated me LOL==''... I had redo this for more than 5 times or more maybe?... definitely desperate need some help here X_X