That is how I'm creating the new sheet. I know it sounds unlikely, but although the new sheet does start with the default style setting the font looks larger than on the original sheet. In other words, a font size of 12 on the new sheet looks more like 20 compared to the original sheet which also has a font size of 12, and a similar thing is happening with the row heights. But if I use the sheet tab to copy one of the orignal sheets the new sheet looks identical to the original.

I suspect the original sheet formatting was done with VBA and it's got something to do with pixel size, but I have no idea how to go about replicating what was done.