Scope in Simulink showing impossible waveforms

My Simulink (Matlab 2018b) has started showing strange results. I have no clue where they come from or what is causing it.

This is the simple model

This is the result in the plot.

I found out my Simulink is doings strange things because I was working on a bigger model and discover that constants were ploted like this.

Does anybody know why is this happening? I tried doing a clear all, but nothing helped.

Thank you in advance.

Answer 1

[Fangjun Jiang]

It's because the "Marker". On the Scope, click View, Style. Change the "Marker".