@ FrequentSLF
FR24 is an amateur system, with limitations on data accuracy. I do not profess to be an expert, but my understanding is that the way the system works is it receives simultaneous data from a number of receivers in well covered areas, and retains data which match from a number of sources and drops the one that disagrees. In areas of sparse coverage this is not possible, and any data received from a single source is taken as valid. Errors may be introduced to the data for several reasons, especially if the receiver is near the range limit. Single spikes (like in this case) are almost always attributable to some data error, while constant data (no change whatsoever) is a sign of extrapolation.