Same code; different image gallery layouts

I am having an issue with my Jetpack enabled image galleries. Despite cutting and pasting the same plain text code; only altering the “ids”; I get several different gallery layouts…

What I want is a simple tiled gallery, consisting of 6 columns and that shows the entire image; like the one that is here:

http://o49s.fallouthosting.com/goldmine-arcade/arcade-game-list/prize-games/
I use the same code; only changing the image “ids” for that gallery; but will get different layouts though I do; such as:

http://o49s.fallouthosting.com/goldmine-arcade/arcade-game-list/arcade-games/
http://o49s.fallouthosting.com/goldmine-arcade/arcade-game-list/simulators/
At times; they have even appear in the mosaic style.

The code used is thus: [gallery size="full" columns="6" type="rectangular" link="file" ids=""]

Does anyone know how to correct this?

https://wordpress.org/plugins/jetpack/