That could be, but I am wondering had you swapped bags around from the motocaddy to the Zip is it would have happened? Just looking at the GIF, the two bags are quite different and Im sure carry their weight differently.The batcaddie and motocaddie were super stable though. It's gotta be the weight placement with the battery.
I'm taking my maiden voyage today and will see how mine does wheelie wise, we have some good slopes to traverse getting to a few tee boxes and on the cart paths going to the next box. (don't know that I will be able to film and operate at the same time since a newbie at this electric cart thing.)
I'm really just looking forward to a relaxing round and not pushing.