Around after Team Q4 lost the National Tournament (Episode 33) the OP for the series changed to feature a new Song, but with the Hanabee release (English Sub and Dub, actually watching the Sub rather than the Dub) it seems the subtitles were hard subs into the footage and thus you see a disconnect with what's on screen and what's in the song (ie. words appearing when there are no words in the song, clearly different words)
But why change the OP's music but leave the animation? if it was to cut cost on redoing the OP's animation wouldn't it then be argued it would have been better to keep the original OP's Music than change it?