I have discovered a glitch with the site.I could report the problem, but I will first leave it as an open forum for all moderators and users alike to see in case I am missing something. I wonder if anyone else is experiencing the same minor glitch. Note that I have tried this on the latest version of Microsoft Edge, Google Chrome, and Firefox, and I get the same results. Below are the steps for replication.
Step 1: Add the current post to the watchlist. The user would normally do this by pressing the "+" button to the right of the "Watchlist" text, as circled in the image below.
Step 2: Remove that post from the watchlist. The user would normally do this by pressing the "-" button corresponding to the one he or she wants to remove from the watchlist.
Now, there is no way to add the same post to the watchlist anymore as the buttons have mysteriously disappeared. Here is a screenshot of a sample screen below:
Note that refreshing the page fixes this issue.