Exporting mods can change/erase some values you put in the modmaker. That tf issue is the most common and, as Hezk said, you have to open your mod with the notepad and fix it manually by putting the tf you want. Other stuff like dq timer and some body modifications will also often be erased, so I suggest doing those directly in the notepad, or to pay close attention to them.

Additionally, changes that can only be made in the notepad (sizes or locations with more than two decimals, or putting a positive number as the negative range of a joint for example) will get modified if you click export.

If you're looking to mod, I highly suggest downloading notepad++, it'll make your life a lot easier