Binance takes a transaction fees on small amounts despite showing transaction fees=0

Hi, don't know if this is the correct sub for this or not so I'll post this anyway.

For a bit of context, I've been trading on binance with very small amounts( around 0.145usdt) that I received through red packets. The way this works is that I use the "convert" option whenever I want to "buy" a particular coin and it lets me do so with seemingly 0 transaction fees, or so I thought. Today I started with 0.147$ and made a gain of roughly 0.11%([not exactly this] not a lot ik, but I'm just practicing.) I was closing for the day, when I noticed that not only did I not have any of the profit, but my total amount was down to 0.145$ despite no transaction fees. I confirmed this by converting to another coin after which my total came back down to 0.143$. Now obviously these are really small amounts that won't really affect the overall portfolio of most traders, but if the app is telling me that there are no transaction fees, then there should be no deduction at all. Am I just tweaking or has anyone else noticed this as well? Is there anything I can do to prevent this or to better understand it? What does this mean for other traders who trade with larger amounts? Does Binance shave off a little bit of money from everyone's accounts without telling them as they did for me?

Any input is appreciated

Edit: spelling