Scientific research needs to rely on valid data to be successful. Magnetic instruments, in particular triaxial magnetometers, can be subject to drifting for various reasons such as temperature variations, loss of alignment, loss of leveling. All these events can have spurious effects on the recorded data. In this article, we show the characterization of one of these cases, the loss of leveling and the changes found on data, as well as the procedure used to correct the effect on the recorded numeric values.