God intervenes in this world, to achieve things that the natural order, left to its own devices, could not; but after the intervention takes place, natural processes may well reassert themselves.
So, for example, Christ changes water into wine, but that wine may not stay wine forever. It can be drunk and digested. Or, if not drunk, it will eventually turn to vinegar.
Likewise — and this is the more salient point — this happens with inspired Scripture. God inspires people with his Word. But texts can be mistranslated, or corrupted, or lost, and of course they can be misinterpreted. This does not mean that we we should not try to ascertain their original, inspired meaning — to the contrary, it underlines the importance of doing so.