Saved positions are off by few 100m.
I tried to track a walking track recently with the app + phonetrack on my personal nextcloud installation.
Unfortunately, the track was very inaccurate. I have to admit it was in the woods but not too narrow trees. It jumps throughout the whole track in no obvious order.
I want to give you an example track together with a manually corrected one of the true path. Interesting is that the accuracy in phonetrack (the blue circle when hovering on a data point) is quite ok (like 20m or so). The real accuracy is more in the range of km.
I am assuming the phonetrack app will save the values correctly in the database so either the app does get wrong values from the phone or there is some other bug. If looking only in the waypoints (not the tracks) it could also be the case that the points are shuffled. The critical walk through the woods is mostly offline. Could it be that the caching in the app gets out of order?
If you need the phonetrack link, I can try what is possible here without publishing my future positions publicly.