The line dimensions I entered are not always correct in the drawing!

[thomas-neemann]

can you make a video of the problem?

[Willem]

When Plane is set on Auto I get problems. Change it to Top view

[degarb]

I get many weird issues like this. I normally kill the program and restart and things get better. Windows ver. .19.

My latest weirdness has been my drawing drifting off the grid on various save iterations, and converged lines that open up and separate.

[degarb]

Yeah, I too had some weird stated measurements. I killed freecad, careful not to save, and reopened. Then, the measurements read correctly. It was just with certain lines, oddly.

[Roy_043]

You can tick/untick the checkbox between points, so if you wish to snap the first point the end of an existing line but then specify a length in Y only, just untick the checkbox after the snapped first point and type in the Y coordinate pressing Enter/Return through Y & Z to accept.

I'd like to point out there is an accuracy issue when using this procedure. The coordinates for the new point are read from the task panel. The accuracy of that point will depend on the 'Number of decimals' setting in the preferences.

Note that this does not explain the OP's findings.