Terraria Community Forums

there might be other sites that would give better advice, such as a minecraft subreddit

What’s the visual bug?

In the new versions, whenever you hit an enemy with your sword, it plays the same animation as scrolling to a new item(moving downwards offscreen and then back up again) in addition to the swinging animation. This makes it difficult to actually see the swinging animation. In 1.8 and before, this wasn't the case, and you could spam click while attacking enemies without your sword moving offscreen.

However, even the older versions have started to do this despite not doing so originally, so i get that effect even when playing, say, 1.7. The .jar file is exactly the same as the original one that didn't have that effect, and it persists even with multiple different launchers.
So basically, an effect from the newer versions has somehow spread to the older versions and i have no idea how.