The reason why it seems to originate from some sources is best explained by what many of the biographers have said. When the Prophet saws recited Surah An-Najm to the Quraysh, they were so stunned by the beauty of the recitation that they prostrated when the last verse was recited, "Fasjudu lillahi wa'abudu" (Therefore, prostrate to Allah and worship Him). Later they were furious with themselves for doing something like that so they invented the tale that they had only done it because the Prophet praised their gods - which was evidently false.