I cannot say why the titles were changed.
In the case of the thread about phones, it could be because you posted it in the “Librem 5” category, but you really were just asking about competitor’s phones, since you said upfront you were not going to buy a Librem 5.
In your monitor thread, it is absolutely unclear what you are hoping to discuss in that thread. There is no context, there are no suggestions, no starting points. You may have an idea of what you want to discuss, but no one else knows.
Your other thread about fanless PCs also has a very meandering, incoherent flow, that leaves lots of half-finished statements and does not provide a clear picture of what you are actually looking for.