What's with the Tetris trademark (TM) locations?

[TurtleWA]

Anyone know what's up with the TM on Tetris games?

I have two different games both for original Gameboy. When comparing them I noticed one has the TM logo up next to the 'S' and one has the 'TM' insignia down below the 'S' with a little star following the TM.

When I do a google image search I see some with the TM up parallel with the 'S' both with and without the star following the TM. I also notice some with the 'TM' below. So three different variations.

Sound familiar to anyone? What's up with this. Thanks.