It's a cheap, non-commercial table for "fun". You end up with bad designs like this. A lot of the cheap "internet" tables on Amazon in the USA have bad designs as well.
Since you are a beginner, just enjoy it as much as you can. If a ball hits the plastic cap around the nail, simply consider it pocketed and move on.
My guess is the builder added the cap to solve a prior problem he was having. The nail head might have been too small and causing the pockets to rip. I've seen that myself on some junk tables. The second problem it might be solving is having a recess for the nail head so the balls don't contact it, which would immediately chip every single ball. We've all seen that in this forum on cheap tables ruining ball sets in a matter of minutes.
A company has to be building tables for a LONG time to really figure out all of these problems, and also have extremely experienced players find faults with the tables so they can improve. A one man shop designing and building the table, will simply never uncover all of these problems.
The other alternative is for a new company to copy a very successful commercial table from the start, but copy it 100%.
Since you are a beginner, just enjoy it as much as you can. If a ball hits the plastic cap around the nail, simply consider it pocketed and move on.
My guess is the builder added the cap to solve a prior problem he was having. The nail head might have been too small and causing the pockets to rip. I've seen that myself on some junk tables. The second problem it might be solving is having a recess for the nail head so the balls don't contact it, which would immediately chip every single ball. We've all seen that in this forum on cheap tables ruining ball sets in a matter of minutes.
A company has to be building tables for a LONG time to really figure out all of these problems, and also have extremely experienced players find faults with the tables so they can improve. A one man shop designing and building the table, will simply never uncover all of these problems.
The other alternative is for a new company to copy a very successful commercial table from the start, but copy it 100%.