Asynchronous script loading overwrites current scripts

Hi, first issue I need to figure out here. I sometimes don't have a decent connection, so the situation is this.

I click on one script and then another, before the first script loads.
The second script loads quicker, since it's a smaller script.
The first script finally loads and unconditionally overwrites the script box with itself, meaning the meta-data does not match the script's source code.

How should I go about solving this? I don't have any ideas...