Hi,
I'm not able to reproduce your issue in JMP 14.1; it looks like you are using JMP 15 or above. I you rebuild your plot step by step, when does the label "Marker" appear?
If possible, it would be helpful to see an example of your data table and graph to check if there are any customizations that are not visible on the plot you shared (e.g. row state in the table, or graphic elements in the plot). Also, I noticed that under the sub-menu "Points", you have the "Error Interval" checked as "Error Bar": is it possible to check that back to "Auto"?
Let's see what we can do.
Best,
TS
Thierry R. Sornasse