Yes, it’s every song. Tested in Brave and Firefox.
There’s also big volume difference with the Trends Database. Preview any song, then click through to the songs main page and play the same section.
The Trends Database page is too loud with no mixer to adjust the volume, or mute the melody (which is really annoying when trying to focus on the chord progression), while the main song page is too quiet, and the mixer is already maxed. 
Random example:
Choose the first song in this list
Then play on the song page
Another related issue is there is no master playback volume for the band mixer that can be saved so the master volume for the song needs adjusting every time a different template is loaded (which then gets applied to the exported MIDI velocity.)